cbcvebase.
CVE-2025-20137
published 2025-05-07

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…

PriorityP424medium4.7CVSS 3.1
AVAACLPRNUINSCCNILAN
EPSS
0.23%
13.5th percentile
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.

Affected

71 ranges· showing 25
VendorProductVersion rangeFixed in
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——
ciscoios——

CVSS provenance

nvdv3.14.7MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
vendor_cisco4.7MEDIUM
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.