{"id":"CVE-2025-52953","aliases":["EUVD-2025-21156","GHSA-h95q-mmmp-cm4m"],"status":"published","title":"Junos OS and Junos OS Evolved: An unauthenticated adjacent attacker sending a valid BGP UPDATE packet forces a BGP session reset","description":"An Expected Behavior Violation vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a valid BGP UPDATE packet to cause a BGP session reset, resulting in a Denial of Service (DoS). \n\nContinuous receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects iBGP and eBGP and both IPv4 and IPv6 are affected by this vulnerability.\n\nThis issue affects Junos OS:\n\n\n  *  All versions before 21.2R3-S9,\n  *  from 21.4 before 21.4R3-S11,\n  *  from 22.2 before 22.2R3-S7,\n  *  from 22.4 before 22.4R3-S7,\n  *  from 23.2 before 23.2R2-S4,\n  *  from 23.4 before 23.4R2-S4,\n  *  from 24.2 before 24.2R2,\n  *  from 24.4 before 24.4R1-S3, 24.4R2\n\n\nJunos OS Evolved:\n\n\n\n  *  All versions before 22.2R3-S7-EVO,\n  *  from 22.4-EVO before 22.4R3-S7-EVO,\n  *  from 23.2-EVO before 23.2R2-S4-EVO,\n  *  from 23.4-EVO before 23.4R2-S4-EVO,\n  *  from 24.2-EVO before 24.2R2-EVO,\n  *  from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.","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:Amber","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00327,"percentile":0.26097,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-440"],"published":"2025-07-11T15:04:55Z","modified":"2026-06-17T09:37:19Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper","product":"junos_os_evolved"},{"vendor":"juniper networks","product":"junos os"},{"vendor":"juniper networks","product":"junos os evolved"}],"references":[{"url":"https://supportportal.juniper.net/JSA100059","tags":["vendor-advisory","Vendor Advisory"]},{"url":"https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/task/routing-protocol-bgp-security-configuring.html","tags":["technical-description","Technical Description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-52953"},{"url":"https://github.com/advisories/GHSA-h95q-mmmp-cm4m"}],"sources":{"cve":[{"id":"CVE-2025-52953","title":"Junos OS and Junos OS Evolved: An unauthenticated adjacent attacker sending a valid BGP UPDATE packet forces a BGP session reset","description":"An Expected Behavior Violation vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a valid BGP UPDATE packet to cause a BGP session reset, resulting in a Denial of Service (DoS). \n\nContinuous receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects iBGP and eBGP and both IPv4 and IPv6 are affected by this vulnerability.\n\nThis issue affects Junos OS:\n\n\n  *  All versions before 21.2R3-S9,\n  *  from 21.4 before 21.4R3-S11,\n  *  from 22.2 before 22.2R3-S7,\n  *  from 22.4 before 22.4R3-S7,\n  *  from 23.2 before 23.2R2-S4,\n  *  from 23.4 before 23.4R2-S4,\n  *  from 24.2 before 24.2R2,\n  *  from 24.4 before 24.4R1-S3, 24.4R2\n\n\nJunos OS Evolved:\n\n\n\n  *  All versions before 22.2R3-S7-EVO,\n  *  from 22.4-EVO before 22.4R3-S7-EVO,\n  *  from 23.2-EVO before 23.2R2-S4-EVO,\n  *  from 23.4-EVO before 23.4R2-S4-EVO,\n  *  from 24.2-EVO before 24.2R2-EVO,\n  *  from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.","status":"published","published":"2025-07-11T15:04:55.14Z","modified":"2025-07-11T20:11:26.659Z","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:Amber","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-440"],"updated_at":"2026-11-02T14:32:31.309974Z"}],"euvd":[{"id":"EUVD-2025-21156","description":"An Expected Behavior Violation vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a valid BGP UPDATE packet to cause a BGP session reset, resulting in a Denial of Service (DoS). \n\nContinuous receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects iBGP and eBGP and both IPv4 and IPv6 are affected by this vulnerability.\n\nThis issue affects Junos OS:\n\n\n  *  All versions before 21.2R3-S9,\n  *  from 21.4 before 21.4R3-S11,\n  *  from 22.2 before 22.2R3-S7,\n  *  from 22.4 before 22.4R3-S7,\n  *  from 23.2 before 23.2R2-S4,\n  *  from 23.4 before 23.4R2-S4,\n  *  from 24.2 before 24.2R2,\n  *  from 24.4 before 24.4R1-S3, 24.4R2\n\n\nJunos OS Evolved:\n\n\n\n  *  All versions before 22.2R3-S7-EVO,\n  *  from 22.4-EVO before 22.4R3-S7-EVO,\n  *  from 23.2-EVO before 23.2R2-S4-EVO,\n  *  from 23.4-EVO before 23.4R2-S4-EVO,\n  *  from 24.2-EVO before 24.2R2-EVO,\n  *  from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.","status":"published","published":"2025-07-11T15:04:55Z","modified":"2025-07-11T20:11:26Z","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:Amber","level":"high"}],"updated_at":"2026-11-02T20:32:09.102762Z"}],"ghsa":[{"id":"GHSA-h95q-mmmp-cm4m","title":"An Expected Behavior Violation vulnerability in the routing protocol daemon (rpd) of Juniper...","description":"An Expected Behavior Violation vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a valid BGP UPDATE packet to cause a BGP session reset, resulting in a Denial of Service (DoS). \n\nContinuous receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects iBGP and eBGP and both IPv4 and IPv6 are affected by this vulnerability.\n\nThis issue affects Junos OS:\n\n\n  *  All versions before 21.2R3-S9,\n  *  from 21.4 before 21.4R3-S11,\n  *  from 22.2 before 22.2R3-S7,\n  *  from 22.4 before 22.4R3-S7,\n  *  from 23.2 before 23.2R2-S4,\n  *  from 23.4 before 23.4R2-S4,\n  *  from 24.2 before 24.2R2,\n  *  from 24.4 before 24.4R1-S3, 24.4R2\n\n\nJunos OS Evolved:\n\n\n\n  *  All versions before 22.2R3-S7-EVO,\n  *  from 22.4-EVO before 22.4R3-S7-EVO,\n  *  from 23.2-EVO before 23.2R2-S4-EVO,\n  *  from 23.4-EVO before 23.4R2-S4-EVO,\n  *  from 24.2-EVO before 24.2R2-EVO,\n  *  from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.","status":"published","published":"2025-07-11T15:31:38Z","modified":"2025-07-11T15:31:44Z","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:Amber","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-440"],"updated_at":"2026-11-02T15:02:59.345355Z"}],"nvd":[{"id":"CVE-2025-52953","description":"An Expected Behavior Violation vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a valid BGP UPDATE packet to cause a BGP session reset, resulting in a Denial of Service (DoS). \n\nContinuous receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects iBGP and eBGP and both IPv4 and IPv6 are affected by this vulnerability.\n\nThis issue affects Junos OS:\n\n\n  *  All versions before 21.2R3-S9,\n  *  from 21.4 before 21.4R3-S11,\n  *  from 22.2 before 22.2R3-S7,\n  *  from 22.4 before 22.4R3-S7,\n  *  from 23.2 before 23.2R2-S4,\n  *  from 23.4 before 23.4R2-S4,\n  *  from 24.2 before 24.2R2,\n  *  from 24.4 before 24.4R1-S3, 24.4R2\n\n\nJunos OS Evolved:\n\n\n\n  *  All versions before 22.2R3-S7-EVO,\n  *  from 22.4-EVO before 22.4R3-S7-EVO,\n  *  from 23.2-EVO before 23.2R2-S4-EVO,\n  *  from 23.4-EVO before 23.4R2-S4-EVO,\n  *  from 24.2-EVO before 24.2R2-EVO,\n  *  from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.","status":"published","published":"2025-07-11T15:15:26.1Z","modified":"2026-06-17T09:37:19.693Z","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:Amber","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-440"],"updated_at":"2026-11-02T14:11:18.285862Z"}]}}