{"id":"CVE-2025-20144","aliases":["EUVD-2025-7290","GHSA-82g5-9hm8-rvm3"],"status":"published","title":"Cisco IOS XR Software Access Control List Bypass Vulnerability","description":"A vulnerability in the hybrid access control list (ACL) processing of IPv4 packets in Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL.\r\n\r\nThis vulnerability is due to incorrect handling of packets when a specific configuration of the hybrid ACL exists. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass a configured ACL on the affected device.\r\nFor more information, see the  section of this advisory.\r\nCisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.","severity":{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00348,"percentile":0.2864,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-284"],"published":"2025-03-12T16:12:39Z","modified":"2026-06-17T08:40:46Z","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-ncs-hybridacl-crMZFfKQ","tags":["Vendor Advisory"]},{"url":"https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/","tags":["Technical Description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-20144"},{"url":"https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp"},{"url":"https://github.com/advisories/GHSA-82g5-9hm8-rvm3"}],"sources":{"cve":[{"id":"CVE-2025-20144","title":"Cisco IOS XR Software Access Control List Bypass Vulnerability","description":"A vulnerability in the hybrid access control list (ACL) processing of IPv4 packets in Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL.\r\n\r\nThis vulnerability is due to incorrect handling of packets when a specific configuration of the hybrid ACL exists. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass a configured ACL on the affected device.\r\nFor more information, see the  section of this advisory.\r\nCisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.","status":"published","published":"2025-03-12T16:12:39.882Z","modified":"2025-03-21T20:33:28.254Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:32:25.186422Z"}],"euvd":[{"id":"EUVD-2025-7290","description":"A vulnerability in the hybrid access control list (ACL) processing of IPv4 packets in Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL.\r\n\r\nThis vulnerability is due to incorrect handling of packets when a specific configuration of the hybrid ACL exists. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass a configured ACL on the affected device.\r\nFor more information, see the  section of this advisory.\r\nCisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.","status":"published","published":"2025-03-12T16:12:39Z","modified":"2025-03-21T20:33:28Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:52:55.622908Z"}],"ghsa":[{"id":"GHSA-82g5-9hm8-rvm3","title":"A vulnerability in the hybrid access control list (ACL) processing of IPv4 packets in Cisco IOS...","description":"A vulnerability in the hybrid access control list (ACL) processing of IPv4 packets in Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL.\n\nThis vulnerability is due to incorrect handling of packets when a specific configuration of the hybrid ACL exists. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass a configured ACL on the affected device.\nFor more information, see the  section of this advisory.\nCisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.","status":"published","published":"2025-03-12T18:32:52Z","modified":"2025-03-12T18:33:01Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T15:00:15.034834Z"}],"nvd":[{"id":"CVE-2025-20144","description":"A vulnerability in the hybrid access control list (ACL) processing of IPv4 packets in Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL.\r\n\r\nThis vulnerability is due to incorrect handling of packets when a specific configuration of the hybrid ACL exists. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass a configured ACL on the affected device.\r\nFor more information, see the  section of this advisory.\r\nCisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.","status":"published","published":"2025-03-12T16:15:21.89Z","modified":"2026-06-17T08:40:46.5Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:10:53.93104Z"}]}}