Vulnerability Details : 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.
Products affected by CVE-2025-20144
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Exploit prediction scoring system (EPSS) score for CVE-2025-20144
0.03%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 5 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2025-20144
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.0
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N |
N/A
|
N/A
|
Cisco:cisco-sa-ncs-hybridacl-crMZFfKQ | 2025-03-12 |
|
4.0
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N |
2.2
|
1.4
|
Cisco Systems, Inc. | 2025-03-12 |
CWE ids for CVE-2025-20144
-
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.Assigned by: psirt@cisco.com (Primary)
References for CVE-2025-20144
-
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ncs-hybridacl-crMZFfKQ
Cisco IOS XR Software Hybrid Access Control List Bypass Vulnerability
-
https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/
Crafting endless AS-PATHS in BGP | APNIC Blog
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