{ "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-2026-21918", "tracking": { "current_release_date": "2026-06-09T14:14:40.888699Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-21918", "initial_release_date": "2026-01-14T18:39:24.465614Z", "revision_history": [ { "date": "2026-01-14T18:39:24.465614Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| Products created (7).| Vendor_assessment created." }, { "date": "2026-01-14T18:39:30.279072Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-01-15T11:10:49.284221Z", "number": "3", "summary": "Source connected.| CVE status created. (valid)| Products connected (6).| References created (27)." }, { "date": "2026-01-15T11:10:57.111091Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-01-15T21:26:59.712171Z", "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": "2026-01-15T21:39:25.191443Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| References created (2).| CWES updated (1).| Unknown change." }, { "date": "2026-01-15T21:39:26.690745Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-01-16T01:41:55.655741Z", "number": "9", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-01-16T10:08:56.136202Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-01-16T14:36:51.441060Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-01-16T14:36:55.489122Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-01-23T20:31:25.652912Z", "number": "13", "summary": "Products connected (61).| Product Identifiers created (61)." }, { "date": "2026-01-23T20:31:37.058752Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-01-24T18:32:44.021655Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-20T10:02:29.436102Z", "number": "16", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T10:02:32.642340Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-03-20T19:21:45.288250Z", "number": "18", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (34).| Product Identifiers created (34).| References created (2).| CWES updated (1)." }, { "date": "2026-03-20T19:21:48.440379Z", "number": "19", "summary": "NCSC Score updated." }, { "date": "2026-04-02T13:53:10.752087Z", "number": "20", "summary": "NCSC Score updated." }, { "date": "2026-04-12T15:02:59.444684Z", "number": "21", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-04-12T15:03:05.545816Z", "number": "22", "summary": "NCSC Score updated." }, { "date": "2026-06-09T14:11:53.202254Z", "number": "23", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-06-09T14:11:55.646155Z", "number": "24", "summary": "NCSC Score updated." } ], "status": "interim", "version": "24" } }, "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 mx series with ms-mpc", "product": { "name": "vers:unknown/os mx series with ms-mpc", "product_id": "CSAFPID-5431502", "product_identification_helper": { "cpe": "cpe:/o:juniper:junos:os_mx_series_with_ms-mpc" } } }, { "category": "product_version_range", "name": "vers:unknown/os mx series with mx-spc3", "product": { "name": "vers:unknown/os mx series with mx-spc3", "product_id": "CSAFPID-5431503", "product_identification_helper": { "cpe": "cpe:/o:juniper:junos:os_mx_series_with_mx-spc3" } } }, { "category": "product_version_range", "name": "vers:unknown/os srx and mx series", "product": { "name": "vers:unknown/os srx and mx series", "product_id": "CSAFPID-5431504", "product_identification_helper": { "cpe": "cpe:/o:juniper:junos:os_srx_and_mx_series" } } }, { "category": "product_version_range", "name": "vers:unknown/os srx series", "product": { "name": "vers:unknown/os srx series", "product_id": "CSAFPID-5431497", "product_identification_helper": { "cpe": "cpe:/o:juniper:junos:os_srx_series" } } }, { "category": "product_version_range", "name": "vers:unknown/paragon automation pathfinder, planner, insights <24.1.1", "product": { "name": "vers:unknown/paragon automation pathfinder, planner, insights <24.1.1", "product_id": "CSAFPID-5431495" } } ], "category": "product_name", "name": "JUNOS" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-2671335", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx5600:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "SRX5600" }, { "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": 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"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/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": 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{ "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-3095848", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:mx480:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mx480" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-3095849", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:mx960:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mx960" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-2671336", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx5800:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx5800" } ], "category": "vendor", "name": "Juniper" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:semver/23.2|<23.2r2-s3", "product": { "name": "vers:semver/23.2|<23.2r2-s3", "product_id": "CSAFPID-1691940" } }, { "category": "product_version_range", "name": "vers:semver/23.4|<23.4r2-s4", "product": { "name": "vers:semver/23.4|<23.4r2-s4", "product_id": "CSAFPID-2470115" } }, { "category": "product_version_range", "name": "vers:semver/24.2|<24.2r2", "product": { "name": "vers:semver/24.2|<24.2r2", "product_id": "CSAFPID-2652984" } }, { "category": "product_version_range", "name": "vers:semver/<22.4r3-s7", "product": { "name": "vers:semver/<22.4r3-s7", "product_id": "CSAFPID-5020121" } } ], "category": "product_name", "name": "Junos OS" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/22.4r3-s7", "product": { "name": "vers:unknown/22.4r3-s7", "product_id": "CSAFPID-5429125" } }, { "category": "product_version_range", "name": "vers:unknown/23.2r2-s3", "product": { "name": "vers:unknown/23.2r2-s3", "product_id": "CSAFPID-5429155" } }, { "category": "product_version_range", "name": "vers:unknown/23.4r2-s4", "product": { "name": "vers:unknown/23.4r2-s4", "product_id": "CSAFPID-5429156" } }, { "category": "product_version_range", "name": "vers:unknown/24.2r2", "product": { "name": "vers:unknown/24.2r2", "product_id": "CSAFPID-5429157" } }, { "category": "product_version_range", "name": "vers:unknown/24.4r1", "product": { "name": "vers:unknown/24.4r1", "product_id": "CSAFPID-5429158" } }, { "category": "product_version_range", "name": "vers:unknown/<23.2r2-s3", "product": { "name": "vers:unknown/<23.2r2-s3", "product_id": "CSAFPID-5429152" } }, { "category": "product_version_range", "name": "vers:unknown/<23.4r2-s4", "product": { "name": "vers:unknown/<23.4r2-s4", "product_id": "CSAFPID-5429153" } }, { "category": "product_version_range", "name": "vers:unknown/<24.2r2", "product": { "name": "vers:unknown/<24.2r2", "product_id": "CSAFPID-5429154" } }, { "category": "product_version_range", "name": "vers:unknown/<=22.4r3-s7", "product": { "name": "vers:unknown/<=22.4r3-s7", "product_id": "CSAFPID-5429122" } } ], "category": "product_name", "name": "OS" } ], "category": "vendor", "name": "Juniper Networks" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5460918", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:mx10004:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mx10004" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5460919", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:mx10008:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mx10008" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5460920", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:mx2008:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mx2008" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5460921", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:mx2010:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mx2010" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5460922", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:mx2020:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mx2020" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5460923", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:mx204:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mx204" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5460924", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:mx304:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mx304" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5124690", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx1500:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx1500" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5457148", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx1600:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx1600" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5457149", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx2300:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx2300" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5124693", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx300:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx300" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5124694", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx320:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx320" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5124695", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx340:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx340" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5124696", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx345:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx345" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5124697", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx380:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx380" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5124699", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx4100:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx4100" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5457150", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx4120:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx4120" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5124700", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx4200:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx4200" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5457151", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx4300:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx4300" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5124701", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx4600:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx4600" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5457152", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx4700:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx4700" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-5124703", "product_identification_helper": { "cpe": "cpe:2.3:h:juniper:srx5400:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "srx5400" } ], "category": "vendor", "name": "juniper" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-21918", "cwe": { "id": "CWE-415", "name": "Double Free" }, "notes": [ { "category": "description", "text": "A Double Free vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX and MX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). On all SRX and MX Series platforms, when during TCP session establishment a specific sequence of packets is encountered a double free happens. This causes flowd to crash and the respective FPC to restart.", "title": "juniper - 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": "description", "text": "A Double Free vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX and MX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). On all SRX and MX Series platforms, when during TCP session establishment a specific sequence of packets is encountered a double free happens. This causes flowd to crash and the respective FPC to restart.\n\n\n\n\n\nThis issue affects Junos OS on SRX and MX Series:\n\n\n\n * all versions before 22.4R3-S7,\n * 23.2 versions before 23.2R2-S3,\n * 23.4 versions before 23.4R2-S4,\n * 24.2 versions before 24.2R2.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-21918" }, { "category": "description", "text": "A Double Free vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX and MX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). On all SRX and MX Series platforms, when during TCP session establishment a specific sequence of packets is encountered a double free happens. This causes flowd to crash and the respective FPC to restart.\n\n\n\n\n\nThis issue affects Junos OS on SRX and MX Series:\n\n\n\n * all versions before 22.4R3-S7,\n * 23.2 versions before 23.2R2-S3,\n * 23.4 versions before 23.4R2-S4,\n * 24.2 versions before 24.2R2.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-21918" }, { "category": "description", "text": "A Double Free vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX and MX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). On all SRX and MX Series platforms, when during TCP session establishment a specific sequence of packets is encountered a double free happens. This causes flowd to crash and the respective FPC to restart.\n\n\n\n\n\nThis issue affects Junos OS on SRX and MX Series:\n\n\n\n * all versions before 22.4R3-S7,\n * 23.2 versions before 23.2R2-S3,\n * 23.4 versions before 23.4R2-S4,\n * 24.2 versions before 24.2R2.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-21918" }, { "category": "other", "text": "0.00021", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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": "8.7", "title": "CVSSV4 base score" }, { "category": "other", "text": "6.9", "title": "NCSC Score" }, { "category": "other", "text": "Is related to a product by vendor Juniper, Is related to (a version of) an uncommon product, There is product data available from source Certbundde, 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)", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" } ], "product_status": { "fixed": [ "CSAFPID-5429125", "CSAFPID-5429155", "CSAFPID-5429156", "CSAFPID-5429157", "CSAFPID-5429158" ], "known_affected": [ "CSAFPID-5429122", "CSAFPID-5429152", "CSAFPID-5429153", "CSAFPID-5429154", "CSAFPID-5019238", "CSAFPID-5431495", "CSAFPID-5431497", "CSAFPID-5431502", "CSAFPID-5431503", "CSAFPID-5431504", "CSAFPID-1691940", "CSAFPID-2470115", "CSAFPID-2652984", "CSAFPID-5020121", "CSAFPID-2177324", "CSAFPID-2177326", "CSAFPID-2505280", "CSAFPID-2535286", "CSAFPID-2671335", "CSAFPID-2671336", "CSAFPID-3095847", "CSAFPID-3095848", "CSAFPID-3095849", "CSAFPID-5124690", "CSAFPID-5124693", "CSAFPID-5124694", "CSAFPID-5124695", "CSAFPID-5124696", "CSAFPID-5124697", "CSAFPID-5124699", "CSAFPID-5124700", "CSAFPID-5124701", "CSAFPID-5124703", "CSAFPID-5383899", "CSAFPID-5383900", "CSAFPID-5383901", "CSAFPID-5383902", "CSAFPID-5383903", "CSAFPID-5383904", "CSAFPID-5383906", "CSAFPID-5383907", "CSAFPID-5383908", "CSAFPID-5383909", "CSAFPID-5411615", "CSAFPID-5412626", "CSAFPID-5412627", "CSAFPID-5412628", "CSAFPID-5457142", "CSAFPID-5457143", "CSAFPID-5457148", "CSAFPID-5457149", "CSAFPID-5457150", "CSAFPID-5457151", "CSAFPID-5457152", "CSAFPID-5460918", "CSAFPID-5460919", "CSAFPID-5460920", "CSAFPID-5460921", "CSAFPID-5460922", "CSAFPID-5460923", "CSAFPID-5460924", "CSAFPID-5460953", "CSAFPID-5460954", "CSAFPID-5460955", "CSAFPID-5460956", "CSAFPID-5460957", "CSAFPID-5460958", "CSAFPID-5460959", "CSAFPID-5460960", "CSAFPID-5460961", "CSAFPID-5460963", "CSAFPID-5460964", "CSAFPID-5460985", "CSAFPID-5460987", "CSAFPID-5461372" ] }, "references": [ { "category": "external", "summary": "Source - juniper", "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": "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-2026-21918" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-21918" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-21918" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21918.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-2026-21918" }, { "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-2026-21918" }, { "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/JSA106018" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://supportportal.juniper.net/JSA106018" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1691940", "CSAFPID-2177324", "CSAFPID-2177326", "CSAFPID-2470115", "CSAFPID-2505280", "CSAFPID-2535286", "CSAFPID-2652984", "CSAFPID-2671335", "CSAFPID-2671336", "CSAFPID-3095847", "CSAFPID-3095848", "CSAFPID-3095849", "CSAFPID-5019238", "CSAFPID-5020121", "CSAFPID-5124690", "CSAFPID-5124693", "CSAFPID-5124694", "CSAFPID-5124695", "CSAFPID-5124696", "CSAFPID-5124697", "CSAFPID-5124699", "CSAFPID-5124700", "CSAFPID-5124701", "CSAFPID-5124703", "CSAFPID-5383899", "CSAFPID-5383900", "CSAFPID-5383901", "CSAFPID-5383902", "CSAFPID-5383903", "CSAFPID-5383904", "CSAFPID-5383906", "CSAFPID-5383907", "CSAFPID-5383908", "CSAFPID-5383909", "CSAFPID-5411615", "CSAFPID-5412626", "CSAFPID-5412627", "CSAFPID-5412628", "CSAFPID-5429122", "CSAFPID-5429152", "CSAFPID-5429153", "CSAFPID-5429154", "CSAFPID-5431495", "CSAFPID-5431497", "CSAFPID-5431502", "CSAFPID-5431503", "CSAFPID-5431504", "CSAFPID-5457142", "CSAFPID-5457143", "CSAFPID-5457148", "CSAFPID-5457149", "CSAFPID-5457150", "CSAFPID-5457151", "CSAFPID-5457152", "CSAFPID-5460918", "CSAFPID-5460919", "CSAFPID-5460920", "CSAFPID-5460921", "CSAFPID-5460922", "CSAFPID-5460923", "CSAFPID-5460924", "CSAFPID-5460953", "CSAFPID-5460954", "CSAFPID-5460955", "CSAFPID-5460956", "CSAFPID-5460957", "CSAFPID-5460958", "CSAFPID-5460959", "CSAFPID-5460960", "CSAFPID-5460961", "CSAFPID-5460963", "CSAFPID-5460964", "CSAFPID-5460985", "CSAFPID-5460987", "CSAFPID-5461372" ] } ], "title": "CVE-2026-21918" } ] }