CVE-2025-20144: Cisco IOS XR

Medium severity, CVSS 5.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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. This 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. For more information, see the section of this advisory. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.

Affected products

• Cisco IOS XR: version 6.5.1 only; version 6.5.2 only; version 6.5.3 only; version 6.5.92 only; version 6.5.93 only; version 6.6.1 only; …

Published 2025-03-12. Last modified 2026-06-17.