CVE-2025-20137

Description

A vulnerability in the access control list (ACL) programming of Cisco IOS Software that is running on Cisco Catalyst 1000 Switches and Cisco Catalyst 2960L Switches could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to the use of both an IPv4 ACL and a dynamic ACL of IP Source Guard on the same interface, which is an unsupported configuration. 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 ACL on the affected device. Note: Cisco documentation has been updated to reflect that this is an unsupported configuration. However, Cisco is publishing this advisory because the device will not prevent an administrator from configuring both features on the same interface. There are no plans to implement the ability to configure both features on the same interface on Cisco Catalyst 1000 or Catalyst 2960L Switches.

Reserved 2024-10-10 | Published 2025-05-07 | Updated 2025-05-07 | Assigner cisco

Problem types

Improper Access Control

Product status

15.2(5a)E
affected

15.2(5b)E
affected

15.2(5c)E
affected

15.2(6)E
affected

15.2(6)E1
affected

15.2(6)E0c
affected

15.2(6)E2
affected

15.2(7)E
affected

15.2(6)E2b
affected

15.2(7)E1
affected

15.2(7)E0a
affected

15.2(7)E0s
affected

15.2(6)E3
affected

15.2(7)E2
affected

15.2(7a)E0b
affected

15.2(7)E3
affected

15.2(7)E1a
affected

15.2(7b)E0b
affected

15.2(7)E4
affected

15.2(7)E3k
affected

15.2(8)E
affected

15.2(8)E1
affected

15.2(7)E5
affected

15.2(7)E6
affected

15.2(8)E2
affected

15.2(7)E7
affected

15.2(8)E3
affected

15.2(7)E8
affected

15.2(8)E4
affected

15.2(7)E9
affected

15.2(8)E5
affected

15.2(8)E6
affected

15.2(7)E10
affected

15.2(7)E11
affected

15.2(7)E12
affected

References

sec.cloudapps.cisco.com/...Advisory/cisco-sa-ipsgacl-pg6qfZk (cisco-sa-ipsgacl-pg6qfZk)

cve.org (CVE-2025-20137)

nvd.nist.gov (CVE-2025-20137)

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