{"id":"CVE-2025-20209","aliases":["EUVD-2025-7579","GHSA-f769-hvjj-2wv2"],"status":"published","title":"Cisco IOS XR Software Internet Key Exchange Version 2 Denial of Service Vulnerability","description":"A vulnerability in the Internet Key Exchange version 2 (IKEv2) function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent an affected device from processing any control plane UDP packets.\u0026nbsp;\r\n\r\nThis vulnerability is due to improper handling of malformed IKEv2 packets. An attacker could exploit this vulnerability by sending malformed IKEv2 packets to an affected device. A successful exploit could allow the attacker to prevent the affected device from processing any control plane UDP packets, resulting in a denial of service (DoS) condition.\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.","severity":{"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","from":"cve"},"epss":{"day":"2026-11-10","score":0.00549,"percentile":0.46297,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-770"],"published":"2025-03-12T16:13:12Z","modified":"2026-06-17T08:41:05Z","products":[{"vendor":"cisco","product":"cisco ios xr software"},{"vendor":"cisco","product":"ios_xr"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xrike-9wYGpRGq","tags":["Vendor Advisory"]},{"url":"https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/","tags":["Not Applicable"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-20209"},{"url":"https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp"},{"url":"https://github.com/advisories/GHSA-f769-hvjj-2wv2"}],"sources":{"cve":[{"id":"CVE-2025-20209","title":"Cisco IOS XR Software Internet Key Exchange Version 2 Denial of Service Vulnerability","description":"A vulnerability in the Internet Key Exchange version 2 (IKEv2) function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent an affected device from processing any control plane UDP packets.\u0026nbsp;\r\n\r\nThis vulnerability is due to improper handling of malformed IKEv2 packets. An attacker could exploit this vulnerability by sending malformed IKEv2 packets to an affected device. A successful exploit could allow the attacker to prevent the affected device from processing any control plane UDP packets, resulting in a denial of service (DoS) condition.\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.","status":"published","published":"2025-03-12T16:13:12.34Z","modified":"2025-03-12T17:51:32.083Z","cvss":[{"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-770"],"updated_at":"2026-11-02T14:32:25.186422Z"}],"euvd":[{"id":"EUVD-2025-7579","description":"A vulnerability in the Internet Key Exchange version 2 (IKEv2) function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent an affected device from processing any control plane UDP packets.\u0026nbsp;\r\n\r\nThis vulnerability is due to improper handling of malformed IKEv2 packets. An attacker could exploit this vulnerability by sending malformed IKEv2 packets to an affected device. A successful exploit could allow the attacker to prevent the affected device from processing any control plane UDP packets, resulting in a denial of service (DoS) condition.\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.","status":"published","published":"2025-03-12T16:13:12Z","modified":"2025-03-12T17:51:32Z","cvss":[{"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"}],"updated_at":"2026-11-02T20:53:05.95539Z"}],"ghsa":[{"id":"GHSA-f769-hvjj-2wv2","title":"A vulnerability in the Internet Key Exchange version 2 (IKEv2) function of Cisco IOS XR Software...","description":"A vulnerability in the Internet Key Exchange version 2 (IKEv2) function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent an affected device from processing any control plane UDP packets.\u0026nbsp;\n\nThis vulnerability is due to improper handling of malformed IKEv2 packets. An attacker could exploit this vulnerability by sending malformed IKEv2 packets to an affected device. A successful exploit could allow the attacker to prevent the affected device from processing any control plane UDP packets, resulting in a denial of service (DoS) condition.\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.","status":"published","published":"2025-03-12T18:32:53Z","modified":"2025-03-12T18:33:01Z","cvss":[{"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-770"],"updated_at":"2026-11-02T15:00:15.034834Z"}],"nvd":[{"id":"CVE-2025-20209","description":"A vulnerability in the Internet Key Exchange version 2 (IKEv2) function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent an affected device from processing any control plane UDP packets.\u0026nbsp;\r\n\r\nThis vulnerability is due to improper handling of malformed IKEv2 packets. An attacker could exploit this vulnerability by sending malformed IKEv2 packets to an affected device. A successful exploit could allow the attacker to prevent the affected device from processing any control plane UDP packets, resulting in a denial of service (DoS) condition.\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.","status":"published","published":"2025-03-12T16:15:22.507Z","modified":"2026-06-17T08:41:05.08Z","cvss":[{"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-770"],"updated_at":"2026-11-02T14:10:53.93104Z"}]}}