{"id":"CVE-2025-52952","aliases":["EUVD-2025-21157","GHSA-pwqr-fp7x-9xcp"],"status":"published","title":"Junos OS: MX Series with MPC-BUILTIN, MPC 1 through MPC 9: Receipt and processing of a malformed packet causes one or more FPCs to crash","description":"An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS).\n\nContinued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects Juniper Networks:\nJunos OS:\n  *  All versions before 22.2R3-S1,\n  *  from 22.4 before 22.4R2.\n\n\nThis feature is not enabled by default.","severity":{"version":"4.0","score":7.1,"vector":"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:Green","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0031,"percentile":0.24128,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2025-07-11T15:04:35Z","modified":"2026-06-17T09:37:19Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper networks","product":"junos os"}],"references":[{"url":"https://supportportal.juniper.net/JSA100058","tags":["vendor-advisory","Vendor Advisory"]},{"url":"https://www.juniper.net/documentation/us/en/software/junos/network-mgmt/topics/topic-map/cfm-configuring.html","tags":["technical-description","Product"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-52952"},{"url":"https://github.com/advisories/GHSA-pwqr-fp7x-9xcp"}],"sources":{"cve":[{"id":"CVE-2025-52952","title":"Junos OS: MX Series with MPC-BUILTIN, MPC 1 through MPC 9: Receipt and processing of a malformed packet causes one or more FPCs to crash","description":"An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS).\n\nContinued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects Juniper Networks:\nJunos OS:\n  *  All versions before 22.2R3-S1,\n  *  from 22.4 before 22.4R2.\n\n\nThis feature is not enabled by default.","status":"published","published":"2025-07-11T15:04:35.691Z","modified":"2025-07-11T20:10:52.673Z","cvss":[{"version":"4.0","score":7.1,"vector":"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:Green","level":"high","assessor":"cna"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:32:31.309974Z"}],"euvd":[{"id":"EUVD-2025-21157","description":"An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS).\n\nContinued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects Juniper Networks:\nJunos OS:\n  *  All versions before 22.2R3-S1,\n  *  from 22.4 before 22.4R2.\n\n\nThis feature is not enabled by default.","status":"published","published":"2025-07-11T15:04:35Z","modified":"2025-07-11T20:10:52Z","cvss":[{"version":"4.0","score":7.1,"vector":"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:Green","level":"high"}],"updated_at":"2026-11-02T20:32:09.102762Z"}],"ghsa":[{"id":"GHSA-pwqr-fp7x-9xcp","title":"An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper...","description":"An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS).\n\nContinued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects Juniper Networks:\nJunos OS:\n  *  All versions before 22.2R3-S1,\n  *  from 22.4 before 22.4R2.\n\n\nThis feature is not enabled by default.","status":"published","published":"2025-07-11T15:31:38Z","modified":"2025-07-11T15:31:39Z","cvss":[{"version":"4.0","score":7.1,"vector":"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/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:C/RE:M/U:Green","level":"high"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:02:59.345355Z"}],"nvd":[{"id":"CVE-2025-52952","description":"An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS).\n\nContinued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects Juniper Networks:\nJunos OS:\n  *  All versions before 22.2R3-S1,\n  *  from 22.4 before 22.4R2.\n\n\nThis feature is not enabled by default.","status":"published","published":"2025-07-11T15:15:25.93Z","modified":"2026-06-17T09:37:19.537Z","cvss":[{"version":"4.0","score":7.1,"vector":"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/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:C/RE:M/U:Green","level":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:11:18.285862Z"}]}}