Vulnerability Monitor

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CVE-2025-20137

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.

Published

2025-05-07T18:15:36.473

Last Modified

2025-08-05T14:08:32.490

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 4.7 (MEDIUM)

Weaknesses
  • Type: Primary
    CWE-284
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System cisco ios 15.2\(5a\)e Yes
Operating System cisco ios 15.2\(5b\)e Yes
Operating System cisco ios 15.2\(5c\)e Yes
Operating System cisco ios 15.2\(6\)e Yes
Operating System cisco ios 15.2\(6\)e0c Yes
Operating System cisco ios 15.2\(6\)e1 Yes
Operating System cisco ios 15.2\(6\)e2 Yes
Operating System cisco ios 15.2\(6\)e2b Yes
Operating System cisco ios 15.2\(6\)e3 Yes
Operating System cisco ios 15.2\(7\)e Yes
Operating System cisco ios 15.2\(7\)e0a Yes
Operating System cisco ios 15.2\(7\)e0s Yes
Operating System cisco ios 15.2\(7\)e1 Yes
Operating System cisco ios 15.2\(7\)e1a Yes
Operating System cisco ios 15.2\(7\)e2 Yes
Operating System cisco ios 15.2\(7\)e3 Yes
Operating System cisco ios 15.2\(7\)e3k Yes
Operating System cisco ios 15.2\(7\)e4 Yes
Operating System cisco ios 15.2\(7\)e5 Yes
Operating System cisco ios 15.2\(7\)e6 Yes
Operating System cisco ios 15.2\(7\)e7 Yes
Operating System cisco ios 15.2\(7\)e8 Yes
Operating System cisco ios 15.2\(7\)e9 Yes
Operating System cisco ios 15.2\(7\)e10 Yes
Operating System cisco ios 15.2\(7\)e11 Yes
Operating System cisco ios 15.2\(7\)e12 Yes
Operating System cisco ios 15.2\(7a\)e0b Yes
Operating System cisco ios 15.2\(7b\)e0b Yes
Operating System cisco ios 15.2\(8\)e Yes
Operating System cisco ios 15.2\(8\)e1 Yes
Operating System cisco ios 15.2\(8\)e2 Yes
Operating System cisco ios 15.2\(8\)e3 Yes
Operating System cisco ios 15.2\(8\)e4 Yes
Operating System cisco ios 15.2\(8\)e5 Yes
Operating System cisco ios 15.2\(8\)e6 Yes
Hardware cisco catalyst_1000-16fp-2g-l - No
Hardware cisco catalyst_1000-16p-2g-l - No
Hardware cisco catalyst_1000-16t-2g-l - No
Hardware cisco catalyst_1000-16t-e-2g-l - No
Hardware cisco catalyst_1000-24fp-4g-l - No
Hardware cisco catalyst_1000-24fp-4x-l - No
Hardware cisco catalyst_1000-24p-4g-l - No
Hardware cisco catalyst_1000-24p-4x-l - No
Hardware cisco catalyst_1000-24pp-4g-l - No
Hardware cisco catalyst_1000-24t-4g-l - No
Hardware cisco catalyst_1000-24t-4x-l - No
Hardware cisco catalyst_1000-48fp-4g-l - No
Hardware cisco catalyst_1000-48fp-4x-l - No
Hardware cisco catalyst_1000-48p-4g-l - No
Hardware cisco catalyst_1000-48p-4x-l - No
Hardware cisco catalyst_1000-48pp-4g-l - No
Hardware cisco catalyst_1000-48t-4g-l - No
Hardware cisco catalyst_1000-48t-4x-l - No
Hardware cisco catalyst_1000-8fp-2g-l - No
Hardware cisco catalyst_1000-8fp-e-2g-l - No
Hardware cisco catalyst_1000-8p-2g-l - No
Hardware cisco catalyst_1000-8p-e-2g-l - No
Hardware cisco catalyst_1000-8t-2g-l - No
Hardware cisco catalyst_1000-8t-e-2g-l - No
Hardware cisco catalyst_1000fe-24p-4g-l - No
Hardware cisco catalyst_1000fe-24t-4g-l - No
Hardware cisco catalyst_1000fe-48p-4g-l - No
Hardware cisco catalyst_1000fe-48t-4g-l - No
Hardware cisco catalyst_2960l-16ps-ll - No
Hardware cisco catalyst_2960l-16ts-ll - No
Hardware cisco catalyst_2960l-24pq-ll - No
Hardware cisco catalyst_2960l-24ps-ll - No
Hardware cisco catalyst_2960l-24tq-ll - No
Hardware cisco catalyst_2960l-24ts-ll - No
Hardware cisco catalyst_2960l-48pq-ll - No
Hardware cisco catalyst_2960l-48ps-ll - No
Hardware cisco catalyst_2960l-48tq-ll - No
Hardware cisco catalyst_2960l-48ts-ll - No
Hardware cisco catalyst_2960l-8ps-ll - No
Hardware cisco catalyst_2960l-8ts-ll - No
References