PT-2025-11100 · Cisco · Cisco Ios Xr

Published 2024-09-02 · Updated 2025-08-04 · CVE-2025-20144

Positive Technologies (AI Summary)

CVSS v3.1

5.8

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions: Cisco IOS XR Software (affected versions not specified)

Description: A vulnerability in the hybrid access control list (ACL) processing of IPv4 packets could allow an unauthenticated, remote attacker to bypass a configured ACL. This issue is due to incorrect handling of packets when a specific configuration of the hybrid ACL exists. An attacker could exploit this by sending traffic through an affected device, potentially allowing them to bypass a configured ACL.

Recommendations: For Cisco IOS XR Software, update to a version that includes the software updates released by Cisco to address this issue. As a temporary workaround, consider configuring the hybrid ACL to prevent incorrect handling of packets until a patch is available. Restrict access to the device to minimize the risk of exploitation.

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

BDU:2025-02697

CVE-2025-20144

Affected Products

Cisco Ios Xr

References · 9

• https://bdu.fstec.ru/vul/2025-02697 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ncs-hybridacl-crMZFfKQ · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-20144 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-20144 · Security Note
• https://twitter.com/CVEnew/status/1899894895441306029 · Twitter Post
• https://twitter.com/vuldb/status/1899892158309818480 · Twitter Post
• https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp · Note
• https://t.me/cveNotify/130740 · Telegram Post
• https://t.me/cvetracker/18995 · Telegram Post