Vulnerability in Cisco iOS Xr Software
CVE-2025-20144
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Cisco iOS Xr Software — versions 6.5.3, 6.5.2, 6.5.92
- Cisco iOS Xr — versions 6.5.1, 6.5.2, 6.5.3
- Cisco Ncs 540-12z20g-Sys-A
- Cisco Ncs 540-12z20g-Sys-D
- Cisco Ncs 540-24q2c2dd-Sys
- Cisco Ncs 540-24q8l2dd-Sys
- Cisco Ncs 540-24z8q2c-Sys
- Cisco Ncs 540-28z4c-Sys-A
- Cisco Ncs 540-28z4c-Sys-D
- Cisco Ncs 540-6z14s-Sys-D
Weakness classification (CWE)
References
- sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-… (Vendor Advisory)
- blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/ (Technical Description)
Frequently asked questions
- What is CVE-2025-20144?
- CVE-2025-20144 is a medium-severity vulnerability in Cisco iOS Xr Software, classified under Improper Access Control. CVSS score: 4.0/10. Published 2025-03-12.
- How severe is CVE-2025-20144?
- Medium severity. CVSS v3 base score is 4.0 out of 10.