{ "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-2026-21911", "tracking": { "current_release_date": "2026-06-09T14:14:45.907799Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-21911", "initial_release_date": "2026-01-14T18:40:13.924859Z", "revision_history": [ { "date": "2026-01-14T18:40:13.924859Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (9).| Vendor_assessment created." }, { "date": "2026-01-14T18:40:18.863799Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-01-15T11:10:45.754114Z", "number": "3", "summary": "Source connected.| CVE status created. (valid)| Products connected (1).| References created (27)." }, { "date": "2026-01-15T11:10:57.111091Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-01-15T20:38:57.825023Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (5).| Products created (1).| References created (2).| CWES updated (1)." }, { "date": "2026-01-15T20:39:00.641411Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-01-15T21:26:48.341741Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-01-15T21:26:50.169344Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-01-15T21:39:26.582412Z", "number": "9", "summary": "Unknown change." }, { "date": "2026-01-16T01:41:53.124334Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-01-16T10:08:54.773862Z", "number": "11", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-01-16T14:36:52.469261Z", "number": "12", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-01-16T14:36:55.489122Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-01-23T17:29:19.962656Z", "number": "14", "summary": "Products connected (54).| Product Identifiers created (54)." }, { "date": "2026-01-23T17:29:24.481278Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-20T06:45:59.468228Z", "number": "16", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (54).| Product Identifiers created (54).| References created (2).| CWES updated (1)." }, { "date": "2026-03-20T06:46:03.778078Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-03-20T10:02:32.529691Z", "number": "18", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-04-12T15:03:01.232076Z", "number": "19", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-04-12T15:03:05.545816Z", "number": "20", "summary": "NCSC Score updated." }, { "date": "2026-06-09T14:11:55.296960Z", "number": "21", "summary": "Source connected.| CVE status created. (valid)| EPSS created." } ], "status": "interim", "version": "21" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "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/21.4", "product": { "name": "vers:unknown/21.4", "product_id": "CSAFPID-2111286", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:-:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r1", "product": { "name": "vers:unknown/21.4-r1", "product_id": "CSAFPID-5383975", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r1-s1", "product": { "name": "vers:unknown/21.4-r1-s1", "product_id": "CSAFPID-5383976", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r1-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r1-s2", "product": { "name": "vers:unknown/21.4-r1-s2", "product_id": "CSAFPID-5383977", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r1-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r2", "product": { "name": "vers:unknown/21.4-r2", "product_id": "CSAFPID-5383978", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r2-s1", "product": { "name": "vers:unknown/21.4-r2-s1", "product_id": "CSAFPID-5385747", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r2-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r2-s2", "product": { "name": "vers:unknown/21.4-r2-s2", "product_id": "CSAFPID-5385748", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r2-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r3", "product": { "name": "vers:unknown/21.4-r3", "product_id": "CSAFPID-5383979", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r3:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r3-s1", "product": { "name": "vers:unknown/21.4-r3-s1", "product_id": "CSAFPID-5385749", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r3-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r3-s2", "product": { "name": "vers:unknown/21.4-r3-s2", "product_id": "CSAFPID-5383980", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r3-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r3-s3", "product": { "name": "vers:unknown/21.4-r3-s3", "product_id": "CSAFPID-5383981", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r3-s3:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r3-s4", "product": { "name": "vers:unknown/21.4-r3-s4", "product_id": "CSAFPID-5383982", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r3-s4:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r3-s5", "product": { "name": "vers:unknown/21.4-r3-s5", "product_id": "CSAFPID-5385750", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r3-s5:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/21.4-r3-s6", "product": { "name": "vers:unknown/21.4-r3-s6", "product_id": "CSAFPID-5383983", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:21.4:r3-s6:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.2", "product": { "name": "vers:unknown/22.2", "product_id": "CSAFPID-2111282", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.2:-:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.2-r1", "product": { "name": "vers:unknown/22.2-r1", "product_id": "CSAFPID-5383994", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.2:r1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.2-r1-s1", "product": { "name": "vers:unknown/22.2-r1-s1", "product_id": "CSAFPID-5385752", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.2:r1-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.2-r1-s2", "product": { "name": 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{ "category": "product_version_range", "name": "vers:unknown/22.3", "product": { "name": "vers:unknown/22.3", "product_id": "CSAFPID-2111281", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.3:-:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.3-r1", "product": { "name": "vers:unknown/22.3-r1", "product_id": "CSAFPID-5385755", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.3:r1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.3-r1-s1", "product": { "name": "vers:unknown/22.3-r1-s1", "product_id": "CSAFPID-5384002", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.3:r1-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.3-r1-s2", "product": { "name": "vers:unknown/22.3-r1-s2", "product_id": "CSAFPID-5384003", "product_identification_helper": { "cpe": 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"product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.3:r3:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.3-r3-s1", "product": { "name": "vers:unknown/22.3-r3-s1", "product_id": "CSAFPID-5384008", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.3:r3-s1:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.3-r3-s2", "product": { "name": "vers:unknown/22.3-r3-s2", "product_id": "CSAFPID-5384009", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.3:r3-s2:*:*:*:*:*:*" } } }, { "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": "vers:unknown/22.4-r1-s2", "product_id": "CSAFPID-5384013", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.4:r1-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r2", "product": { "name": "vers:unknown/22.4-r2", "product_id": "CSAFPID-5385756", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved: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-5384014", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved: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-5384015", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.4:r2-s2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/22.4-r3", "product": { "name": "vers:unknown/22.4-r3", "product_id": "CSAFPID-5384016", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved: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-5457053", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:22.4:r3-s1:*:*:*:*:*:*" } } }, { "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/23.4", "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-r2", "product": { "name": "vers:unknown/23.4-r2", "product_id": "CSAFPID-5457054", "product_identification_helper": { "cpe": "cpe:2.3:o:juniper:junos_os_evolved:23.4:r2:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/<21.4", "product": { "name": "vers:unknown/<21.4", "product_id": "CSAFPID-2798284", "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/22.2|<22.2r3-s4-evo", "product": { "name": "vers:semver/22.2|<22.2r3-s4-evo", "product_id": "CSAFPID-2339535" } }, { "category": "product_version_range", "name": "vers:semver/22.3|<22.3r3-s3-evo", "product": { "name": "vers:semver/22.3|<22.3r3-s3-evo", "product_id": "CSAFPID-2339536" } }, { "category": "product_version_range", "name": "vers:semver/22.4|<22.4r3-s2-evo", "product": { "name": "vers:semver/22.4|<22.4r3-s2-evo", "product_id": "CSAFPID-5435617" } }, { "category": "product_version_range", "name": "vers:semver/23.2|<23.2r2-s1-evo", "product": { "name": "vers:semver/23.2|<23.2r2-s1-evo", "product_id": "CSAFPID-2339537" } }, { "category": "product_version_range", "name": "vers:semver/23.4|<23.4r1-s2-evo,23.4r2-evo", "product": { "name": "vers:semver/23.4|<23.4r1-s2-evo,23.4r2-evo", "product_id": "CSAFPID-2339538" } }, { "category": "product_version_range", "name": "vers:semver/<21.4r3-s7-evo", "product": { "name": "vers:semver/<21.4r3-s7-evo", "product_id": "CSAFPID-2972337" } } ], "category": "product_name", "name": "Junos OS Evolved" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/21.4r3-s7-evo", "product": { "name": "vers:unknown/21.4r3-s7-evo", "product_id": "CSAFPID-5429207" } }, { "category": "product_version_range", "name": "vers:unknown/22.2r3-s4-evo", "product": { "name": "vers:unknown/22.2r3-s4-evo", "product_id": "CSAFPID-5429208" } }, { "category": "product_version_range", "name": "vers:unknown/22.3r3-s3-evo", "product": { "name": "vers:unknown/22.3r3-s3-evo", "product_id": "CSAFPID-5429209" } }, { "category": "product_version_range", "name": "vers:unknown/22.4r3-s2-evo", "product": { "name": "vers:unknown/22.4r3-s2-evo", "product_id": "CSAFPID-5429210" } }, { "category": "product_version_range", "name": "vers:unknown/23.2r2-s1-evo", "product": { "name": "vers:unknown/23.2r2-s1-evo", "product_id": "CSAFPID-5429211" } }, { "category": "product_version_range", "name": "vers:unknown/23.4r1-s2-evo", "product": { "name": "vers:unknown/23.4r1-s2-evo", "product_id": "CSAFPID-5429212" } }, { "category": "product_version_range", "name": "vers:unknown/23.4r2-evo", "product": { "name": "vers:unknown/23.4r2-evo", "product_id": "CSAFPID-5429213" } }, { "category": "product_version_range", "name": "vers:unknown/24.2r1-evo", "product": { "name": "vers:unknown/24.2r1-evo", "product_id": "CSAFPID-5429214" } }, { "category": "product_version_range", "name": "vers:unknown/<=21.4r3-s7-evo|>=22.2|<22.2r3-s4-evo|>=22.3|<22.3r3-s3-evo|>=22.4|<22.4r3-s2-evo|>=23.2|<23.2r2-s1-evo|>=23.4|<23.4r1-s2-evo|<23.4r2-evo", "product": { "name": "vers:unknown/<=21.4r3-s7-evo|>=22.2|<22.2r3-s4-evo|>=22.3|<22.3r3-s3-evo|>=22.4|<22.4r3-s2-evo|>=23.2|<23.2r2-s1-evo|>=23.4|<23.4r1-s2-evo|<23.4r2-evo", "product_id": "CSAFPID-5429206" } } ], "category": "product_name", "name": "OS Evolved" } ], "category": "vendor", "name": "Juniper Networks" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-21911", "notes": [ { "category": "description", "text": "An Incorrect Calculation vulnerability in the Layer 2 Control Protocol Daemon (l2cpd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-adjacent attacker flapping the management interface to cause the learning of new MACs over label-switched interfaces (LSI) to stop while generating a flood of logs, resulting in high CPU usage.", "title": "juniper - 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": "description", "text": "An Incorrect Calculation vulnerability in the Layer 2 Control\n\nProtocol \n\n Daemon (l2cpd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-adjacent attacker flapping the management interface to cause the learning of new MACs over label-switched interfaces (LSI) to stop while generating a flood of logs, resulting in high CPU usage.\n\nWhen the issue is seen, the following log message will be generated:\n\nop:1 flag:0x6 mac:xx:xx:xx:xx:xx:xx bd:2 ifl:13302 reason:0(REASON_NONE) i-op:6(INTRNL_OP_HW_FORCE_DELETE) status:10 lstatus:10 err:26(GETIFBD_VALIDATE_FAILED) err-reason 4(IFBD_VALIDATE_FAIL_EPOCH_MISMATCH) hw_wr:0x4 ctxsync:0 fwdsync:0 rtt-id:51 p_ifl:0 fwd_nh:0 svlbnh:0 event:- smask:0x100000000 dmask:0x0 mplsmask 0x1 act:0x5800 extf:0x0 pfe-id 0 hw-notif-ifl 13302 programmed-ifl 4294967295 pseudo-vtep underlay-ifl-idx 0 stack:GET_MAC, ALLOCATE_MAC, GET_IFL, GET_IFF, GET_IFBD, STOP, \n\n\nThis issue affects Junos OS Evolved: \n\n * all versions before 21.4R3-S7-EVO, \n * from 22.2 before 22.2R3-S4-EVO, \n * from 22.3 before 22.3R3-S3-EVO, \n * from 22.4 before 22.4R3-S2-EVO, \n * from 23.2 before 23.2R2-S1-EVO, \n * from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-21911" }, { "category": "description", "text": "An Incorrect Calculation vulnerability in the Layer 2 Control\n\nProtocol \n\n Daemon (l2cpd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-adjacent attacker flapping the management interface to cause the learning of new MACs over label-switched interfaces (LSI) to stop while generating a flood of logs, resulting in high CPU usage.\n\nWhen the issue is seen, the following log message will be generated:\n\nop:1 flag:0x6 mac:xx:xx:xx:xx:xx:xx bd:2 ifl:13302 reason:0(REASON_NONE) i-op:6(INTRNL_OP_HW_FORCE_DELETE) status:10 lstatus:10 err:26(GETIFBD_VALIDATE_FAILED) err-reason 4(IFBD_VALIDATE_FAIL_EPOCH_MISMATCH) hw_wr:0x4 ctxsync:0 fwdsync:0 rtt-id:51 p_ifl:0 fwd_nh:0 svlbnh:0 event:- smask:0x100000000 dmask:0x0 mplsmask 0x1 act:0x5800 extf:0x0 pfe-id 0 hw-notif-ifl 13302 programmed-ifl 4294967295 pseudo-vtep underlay-ifl-idx 0 stack:GET_MAC, ALLOCATE_MAC, GET_IFL, GET_IFF, GET_IFBD, STOP, \n\n\nThis issue affects Junos OS Evolved: \n\n * all versions before 21.4R3-S7-EVO, \n * from 22.2 before 22.2R3-S4-EVO, \n * from 22.3 before 22.3R3-S3-EVO, \n * from 22.4 before 22.4R3-S2-EVO, \n * from 23.2 before 23.2R2-S1-EVO, \n * from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-21911" }, { "category": "description", "text": "An Incorrect Calculation vulnerability in the Layer 2 Control\n\nProtocol \n\n Daemon (l2cpd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-adjacent attacker flapping the management interface to cause the learning of new MACs over label-switched interfaces (LSI) to stop while generating a flood of logs, resulting in high CPU usage.\n\nWhen the issue is seen, the following log message will be generated:\n\nop:1 flag:0x6 mac:xx:xx:xx:xx:xx:xx bd:2 ifl:13302 reason:0(REASON_NONE) i-op:6(INTRNL_OP_HW_FORCE_DELETE) status:10 lstatus:10 err:26(GETIFBD_VALIDATE_FAILED) err-reason 4(IFBD_VALIDATE_FAIL_EPOCH_MISMATCH) hw_wr:0x4 ctxsync:0 fwdsync:0 rtt-id:51 p_ifl:0 fwd_nh:0 svlbnh:0 event:- smask:0x100000000 dmask:0x0 mplsmask 0x1 act:0x5800 extf:0x0 pfe-id 0 hw-notif-ifl 13302 programmed-ifl 4294967295 pseudo-vtep underlay-ifl-idx 0 stack:GET_MAC, ALLOCATE_MAC, GET_IFL, GET_IFF, GET_IFBD, STOP, \n\n\nThis issue affects Junos OS Evolved: \n\n * all versions before 21.4R3-S7-EVO, \n * from 22.2 before 22.2R3-S4-EVO, \n * from 22.3 before 22.3R3-S3-EVO, \n * from 22.4 before 22.4R3-S2-EVO, \n * from 23.2 before 23.2R2-S1-EVO, \n * from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-21911" }, { "category": "other", "text": "8e-05", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber", "title": "CVSSV4" }, { "category": "other", "text": "7.1", "title": "CVSSV4 base score" }, { "category": "other", "text": "6.1", "title": "NCSC Score" }, { "category": "other", "text": "Is related to a product by vendor Juniper, 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), Is related to (a version of) an uncommon product", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "fixed": [ "CSAFPID-5429207", "CSAFPID-5429208", "CSAFPID-5429209", "CSAFPID-5429210", "CSAFPID-5429211", "CSAFPID-5429212", "CSAFPID-5429213", "CSAFPID-5429214" ], "known_affected": [ "CSAFPID-5429206", "CSAFPID-5019239", "CSAFPID-2339535", "CSAFPID-2339536", "CSAFPID-2339537", "CSAFPID-2339538", "CSAFPID-2972337", "CSAFPID-5435617", "CSAFPID-2111281", "CSAFPID-2111282", "CSAFPID-2111286", "CSAFPID-2111287", "CSAFPID-2111290", "CSAFPID-2505279", "CSAFPID-2798284", "CSAFPID-5383975", "CSAFPID-5383976", "CSAFPID-5383977", "CSAFPID-5383978", "CSAFPID-5383979", "CSAFPID-5383980", "CSAFPID-5383981", "CSAFPID-5383982", "CSAFPID-5383983", "CSAFPID-5383994", "CSAFPID-5383995", "CSAFPID-5383996", "CSAFPID-5383997", "CSAFPID-5383998", "CSAFPID-5383999", "CSAFPID-5384000", "CSAFPID-5384002", "CSAFPID-5384003", "CSAFPID-5384004", "CSAFPID-5384005", "CSAFPID-5384006", "CSAFPID-5384007", "CSAFPID-5384008", "CSAFPID-5384009", "CSAFPID-5384011", "CSAFPID-5384012", "CSAFPID-5384013", "CSAFPID-5384014", "CSAFPID-5384015", "CSAFPID-5384016", "CSAFPID-5384018", "CSAFPID-5384019", "CSAFPID-5384021", "CSAFPID-5385747", "CSAFPID-5385748", "CSAFPID-5385749", "CSAFPID-5385750", "CSAFPID-5385752", "CSAFPID-5385753", "CSAFPID-5385754", "CSAFPID-5385755", "CSAFPID-5385756", "CSAFPID-5385757", "CSAFPID-5412632", "CSAFPID-5412633", "CSAFPID-5457053", "CSAFPID-5457054" ] }, "references": [ { "category": "external", "summary": "Source - juniper", "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": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0117.json" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-21911" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21911.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21911" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-21911" }, { "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-2026-21911" }, { "category": "external", "summary": "Source raw - 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-2026-21911" }, { "category": "external", "summary": "Source - 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=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://supportportal.juniper.net/JSA106010" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://kb.juniper.net/JSA106010" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-2111281", "CSAFPID-2111282", "CSAFPID-2111286", "CSAFPID-2111287", "CSAFPID-2111290", "CSAFPID-2339535", "CSAFPID-2339536", "CSAFPID-2339537", "CSAFPID-2339538", "CSAFPID-2505279", "CSAFPID-2798284", "CSAFPID-2972337", "CSAFPID-5019239", "CSAFPID-5383975", "CSAFPID-5383976", "CSAFPID-5383977", "CSAFPID-5383978", "CSAFPID-5383979", "CSAFPID-5383980", "CSAFPID-5383981", "CSAFPID-5383982", "CSAFPID-5383983", "CSAFPID-5383994", "CSAFPID-5383995", "CSAFPID-5383996", "CSAFPID-5383997", "CSAFPID-5383998", "CSAFPID-5383999", "CSAFPID-5384000", "CSAFPID-5384002", "CSAFPID-5384003", "CSAFPID-5384004", "CSAFPID-5384005", "CSAFPID-5384006", "CSAFPID-5384007", "CSAFPID-5384008", "CSAFPID-5384009", "CSAFPID-5384011", "CSAFPID-5384012", "CSAFPID-5384013", "CSAFPID-5384014", "CSAFPID-5384015", "CSAFPID-5384016", "CSAFPID-5384018", "CSAFPID-5384019", "CSAFPID-5384021", "CSAFPID-5385747", "CSAFPID-5385748", "CSAFPID-5385749", "CSAFPID-5385750", "CSAFPID-5385752", "CSAFPID-5385753", "CSAFPID-5385754", "CSAFPID-5385755", "CSAFPID-5385756", "CSAFPID-5385757", "CSAFPID-5412632", "CSAFPID-5412633", "CSAFPID-5429206", "CSAFPID-5435617", "CSAFPID-5457053", "CSAFPID-5457054" ] } ], "title": "CVE-2026-21911" } ] }