{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-21921", "tracking": { "current_release_date": "2026-06-09T14:14:38.234609Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-21921", "initial_release_date": "2026-01-14T18:39:11.977350Z", "revision_history": [ { "date": "2026-01-14T18:39:11.977350Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (13).| Products connected (1).| Vendor_assessment created." }, { "date": "2026-01-14T18:39:18.106987Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-01-15T11:10:43.911153Z", "number": "3", "summary": "Source connected.| CVE status created. (valid)| Products connected (2).| References created (27)." }, { "date": "2026-01-15T11:10:45.666832Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-01-15T21:27:00.618819Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-01-15T21:27:01.960711Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-01-15T21:39:19.591165Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (6).| References created (2).| CWES updated (1).| Unknown change." }, { "date": "2026-01-15T21:39:21.959953Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-01-16T01:41:53.810450Z", "number": "9", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-01-16T10:08:54.348010Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-01-16T14:36:50.865067Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-01-23T19:27:24.156518Z", "number": "12", "summary": "Products connected (55).| Product Identifiers created (58).| Products created (3)." }, { "date": "2026-01-23T19:27:28.323052Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-20T10:02:28.154471Z", "number": "14", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T10:02:30.027377Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-20T19:22:30.608617Z", "number": "16", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (58).| Product Identifiers created (58).| References created (2).| CWES updated (1)." }, { "date": "2026-04-12T15:02:58.072248Z", "number": "17", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-04-12T15:03:08.759521Z", "number": "18", "summary": "NCSC Score updated." }, { "date": "2026-06-09T14:11:52.327779Z", "number": "19", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-06-09T14:11:55.646155Z", "number": "20", "summary": "NCSC Score updated." } ], "status": "interim", "version": "20" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/os", "product": { "name": "vers:unknown/os", "product_id": "CSAFPID-5019238", "product_identification_helper": { "cpe": "cpe:/o:juniper:junos:os" } } }, { "category": "product_version_range", "name": "vers:unknown/os evolved", "product": { "name": "vers:unknown/os evolved", "product_id": "CSAFPID-5019239", "product_identification_helper": { "cpe": "cpe:/o:juniper:junos:os_evolved" } } } ], "category": "product_name", "name": "JUNOS" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/22.4", "product": { "name": "vers:unknown/22.4", "product_id": "CSAFPID-2177326", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:-:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r1", "product": { "name": "vers:unknown/22.4-r1", "product_id": "CSAFPID-5383899", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r1-s1", "product": { "name": "vers:unknown/22.4-r1-s1", "product_id": "CSAFPID-5411615", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r1-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r1-s2", "product": { "name": "vers:unknown/22.4-r1-s2", "product_id": "CSAFPID-5383900", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r1-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r2", "product": { "name": "vers:unknown/22.4-r2", "product_id": "CSAFPID-5383901", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r2-s1", "product": { "name": "vers:unknown/22.4-r2-s1", "product_id": "CSAFPID-5383902", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r2-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r2-s2", "product": { "name": "vers:unknown/22.4-r2-s2", "product_id": "CSAFPID-5383903", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r2-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3", "product": { "name": "vers:unknown/22.4-r3", "product_id": "CSAFPID-5383904", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r3:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3-s1", "product": { "name": "vers:unknown/22.4-r3-s1", "product_id": "CSAFPID-5457142", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r3-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3-s2", "product": { "name": "vers:unknown/22.4-r3-s2", "product_id": "CSAFPID-5412626", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r3-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3-s3", "product": { "name": "vers:unknown/22.4-r3-s3", "product_id": "CSAFPID-5460953", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r3-s3:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3-s4", "product": { "name": "vers:unknown/22.4-r3-s4", "product_id": "CSAFPID-5460954", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r3-s4:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3-s5", "product": { "name": "vers:unknown/22.4-r3-s5", "product_id": "CSAFPID-5460963", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r3-s5:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3-s6", "product": { "name": "vers:unknown/22.4-r3-s6", "product_id": "CSAFPID-5460985", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r3-s6:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3-s7", "product": { "name": "vers:unknown/22.4-r3-s7", "product_id": "CSAFPID-5461373", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:22.4:r3-s7:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2", "product": { "name": "vers:unknown/23.2", "product_id": "CSAFPID-2177324", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:23.2:-:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2-r1", "product": { "name": "vers:unknown/23.2-r1", "product_id": "CSAFPID-5383906", "product_identification_helper": { "cpe": 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"cpe:2.3:o:juniper:junos:23.4:-:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.4-r1", "product": { "name": "vers:unknown/23.4-r1", "product_id": "CSAFPID-5383909", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:23.4:r1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.4-r1-s1", "product": { "name": "vers:unknown/23.4-r1-s1", "product_id": "CSAFPID-5412628", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:23.4:r1-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.4-r1-s2", "product": { "name": "vers:unknown/23.4-r1-s2", "product_id": "CSAFPID-5460957", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:23.4:r1-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/<22.4", "product": { "name": "vers:unknown/<22.4", "product_id": "CSAFPID-5461372", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "junos" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/22.4", "product": { "name": "vers:unknown/22.4", "product_id": "CSAFPID-2111290", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.4:-:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r1", "product": { "name": "vers:unknown/22.4-r1", "product_id": "CSAFPID-5384011", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.4:r1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r1-s1", "product": { "name": "vers:unknown/22.4-r1-s1", "product_id": "CSAFPID-5384012", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.4:r1-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r1-s2", "product": { "name": 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{ "category": "product_version_range", "name": "vers:unknown/22.4-r3-s4", "product": { "name": "vers:unknown/22.4-r3-s4", "product_id": "CSAFPID-5460967", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.4:r3-s4:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3-s5", "product": { "name": "vers:unknown/22.4-r3-s5", "product_id": "CSAFPID-5460968", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.4:r3-s5:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3-s6", "product": { "name": "vers:unknown/22.4-r3-s6", "product_id": "CSAFPID-5460969", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.4:r3-s6:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3-s7", "product": { "name": "vers:unknown/22.4-r3-s7", "product_id": "CSAFPID-5461461", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.4:r3-s7:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2", "product": { "name": "vers:unknown/23.2", "product_id": "CSAFPID-2111287", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.2:-:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2-r1", "product": { "name": "vers:unknown/23.2-r1", "product_id": "CSAFPID-5384018", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.2:r1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2-r1-s1", "product": { "name": "vers:unknown/23.2-r1-s1", "product_id": "CSAFPID-5384019", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.2:r1-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2-r1-s2", "product": { "name": "vers:unknown/23.2-r1-s2", "product_id": "CSAFPID-5385757", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.2:r1-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2-r2", "product": { "name": "vers:unknown/23.2-r2", "product_id": "CSAFPID-5412632", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.2:r2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2-r2-s1", "product": { "name": "vers:unknown/23.2-r2-s1", "product_id": "CSAFPID-5460970", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2-r2-s2", "product": { "name": "vers:unknown/23.2-r2-s2", "product_id": "CSAFPID-5460971", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2-r2-s3", "product": { "name": "vers:unknown/23.2-r2-s3", "product_id": "CSAFPID-5460978", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s3:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.2-r2-s4", "product": { "name": "vers:unknown/23.2-r2-s4", "product_id": "CSAFPID-5461462", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s4:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.4", "product": { "name": "vers:unknown/23.4", "product_id": "CSAFPID-2505279", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.4:-:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.4-r1", "product": { "name": "vers:unknown/23.4-r1", "product_id": "CSAFPID-5384021", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.4:r1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.4-r1-s1", "product": { "name": "vers:unknown/23.4-r1-s1", "product_id": "CSAFPID-5412633", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/23.4-r1-s2", "product": { "name": "vers:unknown/23.4-r1-s2", "product_id": "CSAFPID-5460972", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/<22.4", "product": { "name": "vers:unknown/<22.4", "product_id": "CSAFPID-5460965", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "junos_os_evolved" } ], "category": "vendor", "name": "Juniper" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:semver/23.2|<23.2r2-s5", "product": { "name": "vers:semver/23.2|<23.2r2-s5", "product_id": "CSAFPID-5435591" } }, { "category": "product_version_range", "name": "vers:semver/23.4|<23.4r2", "product": { "name": "vers:semver/23.4|<23.4r2", "product_id": "CSAFPID-1287610" } }, { "category": "product_version_range", "name": "vers:semver/<22.4r3-s8", "product": { "name": "vers:semver/<22.4r3-s8", "product_id": "CSAFPID-5020098" } } ], "category": "product_name", "name": "Junos OS" }, { "branches": [ { "category": "product_version_range", "name": "vers:semver/23.2|<23.2r2-s5-evo", "product": { "name": "vers:semver/23.2|<23.2r2-s5-evo", "product_id": "CSAFPID-5435598" } }, { "category": "product_version_range", "name": "vers:semver/23.4|<23.4r2-evo", "product": { "name": "vers:semver/23.4|<23.4r2-evo", "product_id": "CSAFPID-2972339" } }, { "category": "product_version_range", "name": "vers:semver/<22.4r3-s8-evo", "product": { "name": "vers:semver/<22.4r3-s8-evo", "product_id": "CSAFPID-5020099" } } ], "category": "product_name", "name": "Junos OS Evolved" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<23.2r2-s5", "product": { "name": "vers:unknown/<23.2r2-s5", "product_id": "CSAFPID-5429140" } }, { "category": "product_version_range", "name": "vers:unknown/<23.4r2", "product": { "name": "vers:unknown/<23.4r2", "product_id": "CSAFPID-5429124" } }, { "category": "product_version_range", "name": "vers:unknown/<=22.4r3-s8", "product": { "name": "vers:unknown/<=22.4r3-s8", "product_id": "CSAFPID-5429139" } }, { "category": "product_version_range", "name": "vers:unknown/>=22.4r3-s8", "product": { "name": "vers:unknown/>=22.4r3-s8", "product_id": "CSAFPID-5429148" } }, { "category": "product_version_range", "name": "vers:unknown/>=23.2r2-s5", "product": { "name": "vers:unknown/>=23.2r2-s5", "product_id": "CSAFPID-5429149" } }, { "category": "product_version_range", "name": "vers:unknown/>=23.4r2", "product": { "name": "vers:unknown/>=23.4r2", "product_id": "CSAFPID-5429150" } }, { "category": "product_version_range", "name": "vers:unknown/>=24.2r1", "product": { "name": "vers:unknown/>=24.2r1", "product_id": "CSAFPID-5429151" } } ], "category": "product_name", "name": "OS" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<23.2r2-s5-evo", "product": { "name": "vers:unknown/<23.2r2-s5-evo", "product_id": "CSAFPID-5429142" } }, { "category": "product_version_range", "name": "vers:unknown/<23.4r2-evo", "product": { "name": "vers:unknown/<23.4r2-evo", "product_id": "CSAFPID-5429143" } }, { "category": "product_version_range", "name": "vers:unknown/<=22.4r3-s8-evo", "product": { "name": "vers:unknown/<=22.4r3-s8-evo", "product_id": "CSAFPID-5429141" } }, { "category": "product_version_range", "name": "vers:unknown/>=22.4r3-s8-evo", "product": { "name": "vers:unknown/>=22.4r3-s8-evo", "product_id": "CSAFPID-5429144" } }, { "category": "product_version_range", "name": "vers:unknown/>=23.2r2-s5-evo", "product": { "name": "vers:unknown/>=23.2r2-s5-evo", "product_id": "CSAFPID-5429145" } }, { "category": "product_version_range", "name": "vers:unknown/>=23.4r2-evo", "product": { "name": "vers:unknown/>=23.4r2-evo", "product_id": "CSAFPID-5429146" } }, { "category": "product_version_range", "name": "vers:unknown/>=24.2r1-evo", "product": { "name": "vers:unknown/>=24.2r1-evo", "product_id": "CSAFPID-5429147" } } ], "category": "product_name", "name": "OS Evolved" } ], "category": "vendor", "name": "Juniper Networks" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-21921", "cwe": { "id": "CWE-416", "name": "Use After Free" }, "notes": [ { "category": "description", "text": "A Use After Free vulnerability in the chassis daemon (chassisd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker authenticated with low privileges to cause a Denial-of-Service (DoS). When telemetry collectors are frequently subscribing and unsubscribing to sensors continuously over a long period of time, telemetry-capable processes like chassisd, rpd or mib2d will crash and restart, which - depending on the process - can cause a complete outage until the system has recovered.", "title": "juniper - https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-When-telemetry-collectors-are-frequently-subscribing-and-unsubscribing-to-sensors-chassisd-or-rpd-will-crash-CVE-2026-21921" }, { "category": "description", "text": "A Use After Free vulnerability in the chassis daemon (chassisd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker authenticated with low privileges to cause a Denial-of-Service (DoS).\n\nWhen telemetry collectors are frequently subscribing and unsubscribing to sensors continuously over a long period of time, telemetry-capable processes like chassisd, rpd or mib2d will crash and restart, which - depending on the process - can cause a complete outage until the system has recovered.\n\nThis issue affects:\n\n Junos OS: \n\n\n\n * all versions before 22.4R3-S8,\n * 23.2 versions before 23.2R2-S5,\n * 23.4 versions before 23.4R2;\n\n\n\n\nJunos OS Evolved:\n\n\n\n * all versions before 22.4R3-S8-EVO,\n * 23.2 versions before 23.2R2-S5-EVO,\n * 23.4 versions before 23.4R2-EVO.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-21921" }, { "category": "description", "text": "A Use After Free vulnerability in the chassis daemon (chassisd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker authenticated with low privileges to cause a Denial-of-Service (DoS).\n\nWhen telemetry collectors are frequently subscribing and unsubscribing to sensors continuously over a long period of time, telemetry-capable processes like chassisd, rpd or mib2d will crash and restart, which - depending on the process - can cause a complete outage until the system has recovered.\n\nThis issue affects:\n\n Junos OS: \n\n\n\n * all versions before 22.4R3-S8,\n * 23.2 versions before 23.2R2-S5,\n * 23.4 versions before 23.4R2;\n\n\n\n\nJunos OS Evolved:\n\n\n\n * all versions before 22.4R3-S8-EVO,\n * 23.2 versions before 23.2R2-S5-EVO,\n * 23.4 versions before 23.4R2-EVO.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-21921" }, { "category": "description", "text": "A Use After Free vulnerability in the chassis daemon (chassisd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker authenticated with low privileges to cause a Denial-of-Service (DoS).\n\nWhen telemetry collectors are frequently subscribing and unsubscribing to sensors continuously over a long period of time, telemetry-capable processes like chassisd, rpd or mib2d will crash and restart, which - depending on the process - can cause a complete outage until the system has recovered.\n\nThis issue affects:\n\n Junos OS: \n\n\n\n * all versions before 22.4R3-S8,\n * 23.2 versions before 23.2R2-S5,\n * 23.4 versions before 23.4R2;\n\n\n\n\nJunos OS Evolved:\n\n\n\n * all versions before 22.4R3-S8-EVO,\n * 23.2 versions before 23.2R2-S5-EVO,\n * 23.4 versions before 23.4R2-EVO.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-21921" }, { "category": "other", "text": "0.00021", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:X/RE:M/U:X", "title": "CVSSV4" }, { "category": "other", "text": "7.1", "title": "CVSSV4 base score" }, { "category": "other", "text": "6.4", "title": "NCSC Score" }, { "category": "other", "text": "Is related to a product by vendor Juniper, Is related to (a version of) an uncommon product, Is related to an uncommon product source", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "The CVSS vector string contains AV:N (Attack Vector: Network), There is cwe data available from source Nvd", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "fixed": [ "CSAFPID-5429144", "CSAFPID-5429145", "CSAFPID-5429146", "CSAFPID-5429147", "CSAFPID-5429148", "CSAFPID-5429149", "CSAFPID-5429150", "CSAFPID-5429151" ], "known_affected": [ "CSAFPID-5429124", "CSAFPID-5429139", "CSAFPID-5429140", "CSAFPID-5429141", "CSAFPID-5429142", "CSAFPID-5429143", "CSAFPID-5019238", "CSAFPID-5019239", "CSAFPID-1287610", "CSAFPID-2972339", "CSAFPID-5020098", "CSAFPID-5020099", "CSAFPID-5435591", "CSAFPID-5435598", "CSAFPID-2111287", "CSAFPID-2111290", "CSAFPID-2177324", "CSAFPID-2177326", "CSAFPID-2505279", "CSAFPID-2505280", "CSAFPID-5383899", "CSAFPID-5383900", "CSAFPID-5383901", "CSAFPID-5383902", "CSAFPID-5383903", "CSAFPID-5383904", "CSAFPID-5383906", "CSAFPID-5383907", "CSAFPID-5383908", "CSAFPID-5383909", "CSAFPID-5384011", "CSAFPID-5384012", "CSAFPID-5384013", "CSAFPID-5384014", "CSAFPID-5384015", "CSAFPID-5384016", "CSAFPID-5384018", "CSAFPID-5384019", "CSAFPID-5384021", "CSAFPID-5385756", "CSAFPID-5385757", "CSAFPID-5411615", "CSAFPID-5412626", "CSAFPID-5412627", "CSAFPID-5412628", "CSAFPID-5412631", "CSAFPID-5412632", "CSAFPID-5412633", "CSAFPID-5457053", "CSAFPID-5457142", "CSAFPID-5460953", "CSAFPID-5460954", "CSAFPID-5460955", "CSAFPID-5460956", "CSAFPID-5460957", "CSAFPID-5460963", "CSAFPID-5460965", "CSAFPID-5460966", "CSAFPID-5460967", "CSAFPID-5460968", "CSAFPID-5460969", "CSAFPID-5460970", "CSAFPID-5460971", "CSAFPID-5460972", "CSAFPID-5460978", "CSAFPID-5460985", "CSAFPID-5460986", "CSAFPID-5461372", "CSAFPID-5461373", "CSAFPID-5461460", "CSAFPID-5461461", "CSAFPID-5461462" ] }, "references": [ { "category": "external", "summary": "Source - juniper", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-When-telemetry-collectors-are-frequently-subscribing-and-unsubscribing-to-sensors-chassisd-or-rpd-will-crash-CVE-2026-21921" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0117.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21921" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-21921" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-21921" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21921.json" }, { "category": "external", "summary": "Source - hkcert", "url": "https://www.hkcert.org/security-bulletin/juniper-junos-os-multiple-vulnerabilities_20260116" }, { "category": "external", "summary": "Source - ncscclear", "url": "https://advisories.ncsc.nl/advisory?id=NCSC-2026-0017" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-21921" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-21921" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=10000" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=20000" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0117.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0117" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/global-search/%40uri#sortCriteria=date%20descending&f-sf_primarysourcename=Knowledge&f-sf_articletype=Security%20Advisories&numberOfResults=100" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-BGP-update-with-a-set-of-specific-attributes-causes-rpd-crash-CVE-2025-60003" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-DHCP-Option-82-messages-from-clients-being-passed-unmodified-to-the-DHCP-server-CVE-2025-59960" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-Executing-a-specific-show-command-leads-to-an-rpd-crash-CVE-2025-59959" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-Optional-transitive-BGP-attribute-is-modified-before-propagation-to-peers-causing-sessions-to-flap-CVE-2025-60011" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-Receipt-of-specific-IS-IS-update-packet-causes-memory-leak-leading-to-RPD-crash-CVE-2026-21909" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-Unix-socket-used-to-control-the-jdhcpd-process-is-world-writable-CVE-2025-59961" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-Use-after-free-vulnerability-In-802-1X-authentication-daemon-can-cause-crash-of-the-dot1xd-process-CVE-2026-21908" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-When-telemetry-collectors-are-frequently-subscribing-and-unsubscribing-to-sensors-chassisd-or-rpd-will-crash-CVE-2026-21921" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-A-specifically-crafted-show-chassis-command-causes-chassisd-to-crash-CVE-2025-60007" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-Evolved-A-Linux-kernel-vulnerability-in-the-HID-driver-allows-an-attacker-to-read-information-from-the-HID-Report-buffer-CVE-2024-50302" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-Evolved-Flapping-management-interface-causes-MAC-learning-on-label-switched-interfaces-to-stop-CVE-2026-21911" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-EX4000-A-high-volume-of-traffic-destinated-to-the-device-leads-to-a-crash-and-restart-CVE-2026-21913" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-EX4k-Series-QFX5k-Series-In-an-EVPN-VXLAN-configuration-link-flaps-cause-Inter-VNI-traffic-drop-CVE-2026-21910" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-MX10k-Series-show-system-firmware-CLI-command-may-lead-to-LC480-or-LC2101-line-card-reset-CVE-2026-21912" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-Receipt-of-a-specifically-malformed-ICMP-packet-causes-an-FPC-restart-CVE-2026-0203" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-SRX-and-MX-Series-When-TCP-packets-occur-in-a-specific-sequence-flowd-crashes-CVE-2026-21918" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-SRX-Series-A-specifically-malformed-GTP-message-will-cause-an-FPC-crash-CVE-2026-21914" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-SRX-Series-If-a-specific-request-is-processed-by-the-DNS-subsystem-flowd-will-crash-CVE-2026-21920" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-SRX-Series-MX-Series-with-MX-SPC3-or-MS-MPC-Receipt-of-multiple-specific-SIP-messages-results-in-flow-management-process-crash-CVE-2026-21905" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-SRX-Series-Specifically-malformed-SSL-packet-causes-FPC-crash-CVE-2026-21917" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-SRX-Series-With-GRE-performance-acceleration-enabled-receipt-of-a-specific-ICMP-packet-causes-the-PFE-to-crash-CVE-2026-21906" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-OS-Subscribing-to-telemetry-sensors-at-scale-causes-all-FPCs-to-crash-CVE-2026-21903" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Junos-Space-TLS-SSL-server-supports-use-of-static-key-ciphers-ssl-static-key-ciphers-CVE-2026-21907" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://supportportal.juniper.net/s/article/2026-01-Security-Bulletin-Paragon-Automation-A-clickjacking-vulnerability-in-the-web-server-configuration-has-been-addressed-CVE-2025-52987" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://kb.juniper.net/JSA106021" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://supportportal.juniper.net/JSA106021" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1287610", "CSAFPID-2111287", "CSAFPID-2111290", "CSAFPID-2177324", "CSAFPID-2177326", "CSAFPID-2505279", "CSAFPID-2505280", "CSAFPID-2972339", "CSAFPID-5019238", "CSAFPID-5019239", "CSAFPID-5020098", "CSAFPID-5020099", "CSAFPID-5383899", "CSAFPID-5383900", "CSAFPID-5383901", "CSAFPID-5383902", "CSAFPID-5383903", "CSAFPID-5383904", "CSAFPID-5383906", "CSAFPID-5383907", "CSAFPID-5383908", "CSAFPID-5383909", "CSAFPID-5384011", "CSAFPID-5384012", "CSAFPID-5384013", "CSAFPID-5384014", "CSAFPID-5384015", "CSAFPID-5384016", "CSAFPID-5384018", "CSAFPID-5384019", "CSAFPID-5384021", "CSAFPID-5385756", "CSAFPID-5385757", "CSAFPID-5411615", "CSAFPID-5412626", "CSAFPID-5412627", "CSAFPID-5412628", "CSAFPID-5412631", "CSAFPID-5412632", "CSAFPID-5412633", "CSAFPID-5429124", "CSAFPID-5429139", "CSAFPID-5429140", "CSAFPID-5429141", "CSAFPID-5429142", "CSAFPID-5429143", "CSAFPID-5435591", "CSAFPID-5435598", "CSAFPID-5457053", "CSAFPID-5457142", "CSAFPID-5460953", "CSAFPID-5460954", "CSAFPID-5460955", "CSAFPID-5460956", "CSAFPID-5460957", "CSAFPID-5460963", "CSAFPID-5460965", "CSAFPID-5460966", "CSAFPID-5460967", "CSAFPID-5460968", "CSAFPID-5460969", "CSAFPID-5460970", "CSAFPID-5460971", "CSAFPID-5460972", "CSAFPID-5460978", "CSAFPID-5460985", "CSAFPID-5460986", "CSAFPID-5461372", "CSAFPID-5461373", "CSAFPID-5461460", "CSAFPID-5461461", "CSAFPID-5461462" ] } ], "title": "CVE-2026-21921" } ] }