CVE-2025-20137

Name: CVE-2025-20137
Creator: NVD / NIST
Published: 2025-05-07T18:15:36.473+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.7/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2025-20137 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.7/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

EPSS Probability

0.23%

13.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Cisco	Ios	15.2\(5a\)e
Cisco	Ios	15.2\(5b\)e
Cisco	Ios	15.2\(5c\)e
Cisco	Ios	15.2\(6\)e
Cisco	Ios	15.2\(6\)e0c
Cisco	Ios	15.2\(6\)e1
Cisco	Ios	15.2\(6\)e2
Cisco	Ios	15.2\(6\)e2b
Cisco	Ios	15.2\(6\)e3
Cisco	Ios	15.2\(7\)e
Cisco	Ios	15.2\(7\)e0a
Cisco	Ios	15.2\(7\)e0s
Cisco	Ios	15.2\(7\)e1
Cisco	Ios	15.2\(7\)e1a
Cisco	Ios	15.2\(7\)e2
Cisco	Ios	15.2\(7\)e3
Cisco	Ios	15.2\(7\)e3k
Cisco	Ios	15.2\(7\)e4
Cisco	Ios	15.2\(7\)e5
Cisco	Ios	15.2\(7\)e6
Cisco	Ios	15.2\(7\)e7
Cisco	Ios	15.2\(7\)e8
Cisco	Ios	15.2\(7\)e9
Cisco	Ios	15.2\(7\)e10
Cisco	Ios	15.2\(7\)e11
Cisco	Ios	15.2\(7\)e12
Cisco	Ios	15.2\(7a\)e0b
Cisco	Ios	15.2\(7b\)e0b
Cisco	Ios	15.2\(8\)e
Cisco	Ios	15.2\(8\)e1
Cisco	Ios	15.2\(8\)e2
Cisco	Ios	15.2\(8\)e3
Cisco	Ios	15.2\(8\)e4
Cisco	Ios	15.2\(8\)e5
Cisco	Ios	15.2\(8\)e6

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipsgacl-pg6qfZkVendor Advisory

Timeline

Published: May 7, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-20137?

How severe is CVE-2025-20137?

CVE-2025-20137 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2025-20137?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-20137?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST