{"id":"CVE-2026-33778","aliases":["EUVD-2026-21197","GHSA-q559-6pc6-gxfh"],"status":"published","title":"Junos OS: SRX Series, MX Series: When a specifically malformed first ISAKMP packet is received kmd/iked crashes","description":"An Improper Validation of Syntactic Correctness of Input vulnerability in the  IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS).\n\nIf an affected device receives a specifically malformed first ISAKMP packet from the initiator, the kmd/iked process will crash and restart, which momentarily prevents new security associations (SAs) for from being established. Repeated exploitation of this vulnerability causes a complete inability to establish new VPN connections.\n\nThis issue affects Junos OS on \n\nSRX Series and MX Series:\n\n\n\n  *  all versions before 22.4R3-S9,\n  *  23.2 version before 23.2R2-S6,\n  *  23.4 version before 23.4R2-S7,\n  *  24.2 versions before 24.2R2-S4,\n  *  24.4 versions before 24.4R2-S3,\n  *  25.2 versions before 25.2R1-S2, 25.2R2.","severity":{"version":"4.0","score":8.7,"vector":"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/AU:Y/RE:M","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00344,"percentile":0.28296,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1286"],"published":"2026-04-09T21:35:10Z","modified":"2026-10-26T21:10:00Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper networks","product":"junos os"}],"references":[{"url":"https://kb.juniper.net/JSA107868","tags":["vendor-advisory","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33778"},{"url":"https://github.com/advisories/GHSA-q559-6pc6-gxfh"}],"sources":{"cve":[{"id":"CVE-2026-33778","title":"Junos OS: SRX Series, MX Series: When a specifically malformed first ISAKMP packet is received kmd/iked crashes","description":"An Improper Validation of Syntactic Correctness of Input vulnerability in the  IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS).\n\nIf an affected device receives a specifically malformed first ISAKMP packet from the initiator, the kmd/iked process will crash and restart, which momentarily prevents new security associations (SAs) for from being established. Repeated exploitation of this vulnerability causes a complete inability to establish new VPN connections.\n\nThis issue affects Junos OS on \n\nSRX Series and MX Series:\n\n\n\n  *  all versions before 22.4R3-S9,\n  *  23.2 version before 23.2R2-S6,\n  *  23.4 version before 23.4R2-S7,\n  *  24.2 versions before 24.2R2-S4,\n  *  24.4 versions before 24.4R2-S3,\n  *  25.2 versions before 25.2R1-S2, 25.2R2.","status":"published","published":"2026-04-09T21:35:10.585Z","modified":"2026-04-10T14:11:42.844Z","cvss":[{"version":"4.0","score":8.7,"vector":"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/AU:Y/RE:M","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-1286"],"updated_at":"2026-11-02T14:20:08.009733Z"}],"euvd":[{"id":"EUVD-2026-21197","description":"An Improper Validation of Syntactic Correctness of Input vulnerability in the  IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS).\n\nIf an affected device receives a specifically malformed first ISAKMP packet from the initiator, the kmd/iked process will crash and restart, which momentarily prevents new security associations (SAs) for from being established. Repeated exploitation of this vulnerability causes a complete inability to establish new VPN connections.\n\nThis issue affects Junos OS on \n\nSRX Series and MX Series:\n\n\n\n  *  all versions before 22.4R3-S9,\n  *  23.2 version before 23.2R2-S6,\n  *  23.4 version before 23.4R2-S7,\n  *  24.2 versions before 24.2R2-S4,\n  *  24.4 versions before 24.4R2-S3,\n  *  25.2 versions before 25.2R1-S2, 25.2R2.","status":"published","published":"2026-04-09T21:35:10Z","modified":"2026-04-10T14:11:42Z","cvss":[{"version":"4.0","score":8.7,"vector":"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/AU:Y/RE:M","level":"high"}],"updated_at":"2026-11-02T19:24:29.850635Z"}],"ghsa":[{"id":"GHSA-q559-6pc6-gxfh","title":"An Improper Validation of Syntactic Correctness of Input vulnerability in the  IPsec library used...","description":"An Improper Validation of Syntactic Correctness of Input vulnerability in the  IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS).\n\nIf an affected device receives a specifically malformed first ISAKMP packet from the initiator, the kmd/iked process will crash and restart, which momentarily prevents new security associations (SAs) for from being established. Repeated exploitation of this vulnerability causes a complete inability to establish new VPN connections.\n\nThis issue affects Junos OS on \n\nSRX Series and MX Series:\n\n\n\n  *  all versions before 22.4R3-S9,\n  *  23.2 version before 23.2R2-S6,\n  *  23.4 version before 23.4R2-S7,\n  *  24.2 versions before 24.2R2-S4,\n  *  24.4 versions before 24.4R2-S3,\n  *  25.2 versions before 25.2R1-S2, 25.2R2.","status":"published","published":"2026-04-10T00:30:29Z","modified":"2026-04-10T00:30:37Z","cvss":[{"version":"4.0","score":8.7,"vector":"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:X/V:X/RE:M/U:X","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1286"],"updated_at":"2026-11-02T15:07:24.354029Z"}],"nvd":[{"id":"CVE-2026-33778","description":"An Improper Validation of Syntactic Correctness of Input vulnerability in the  IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS).\n\nIf an affected device receives a specifically malformed first ISAKMP packet from the initiator, the kmd/iked process will crash and restart, which momentarily prevents new security associations (SAs) for from being established. Repeated exploitation of this vulnerability causes a complete inability to establish new VPN connections.\n\nThis issue affects Junos OS on \n\nSRX Series and MX Series:\n\n\n\n  *  all versions before 22.4R3-S9,\n  *  23.2 version before 23.2R2-S6,\n  *  23.4 version before 23.4R2-S7,\n  *  24.2 versions before 24.2R2-S4,\n  *  24.4 versions before 24.4R2-S3,\n  *  25.2 versions before 25.2R1-S2, 25.2R2.","status":"published","published":"2026-04-09T22:16:26.5Z","modified":"2026-10-26T21:10:00.17Z","cvss":[{"version":"4.0","score":8.7,"vector":"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:X/V:X/RE:M/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-1286"],"updated_at":"2026-11-02T14:12:13.902911Z"}]}}