CVE-2025-20144: Cisco IOS XR Software Access Control List Bypass Vulnerability
First published: Wed Mar 12 2025(Updated: )
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.
Credit: psirt@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XRv 9000 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-20144?
CVE-2025-20144 has been assigned a high severity rating due to its potential to allow unauthenticated remote access to bypass security controls.
How do I fix CVE-2025-20144?
To fix CVE-2025-20144, you should apply the latest patches provided by Cisco for affected versions of IOS XR Software.
Which versions of Cisco IOS XR Software are affected by CVE-2025-20144?
CVE-2025-20144 affects multiple versions of Cisco IOS XR Software, particularly those configured with specific hybrid ACL settings.
What is the impact of exploiting CVE-2025-20144?
Exploiting CVE-2025-20144 allows an attacker to bypass configured access control lists, potentially leading to unauthorized access to network resources.
Is authentication required to exploit CVE-2025-20144?
No, CVE-2025-20144 can be exploited by an unauthenticated remote attacker, making it particularly dangerous.
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