Vulnerability Details : CVE-2025-20145
A vulnerability in the access control list (ACL) processing in the egress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL.
This vulnerability exists because certain packets are handled incorrectly when they are received on an ingress interface on one line card and destined out of an egress interface on another line card where the egress ACL is configured. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass an egress ACL on the affected device.
For more information about this vulnerability, see the section of this advisory.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
Products affected by CVE-2025-20145
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Exploit prediction scoring system (EPSS) score for CVE-2025-20145
0.03%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 7 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2025-20145
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.8
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
N/A
|
N/A
|
Cisco:cisco-sa-modular-ACL-u5MEPXMm | 2025-03-12 |
|
5.8
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
3.9
|
1.4
|
Cisco Systems, Inc. | 2025-03-12 |
CWE ids for CVE-2025-20145
-
Assigned by: psirt@cisco.com (Primary)
References for CVE-2025-20145
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https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-modular-ACL-u5MEPXMm
Cisco IOS XR Software Access Control List Bypass Vulnerability
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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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