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: 2025-05-07 Last update: 2025-08-05 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-20137 is rated Low Risk (28.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.10%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-20137

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-03 0.04% 0.10% +0.06%
2 2025-09-06 0.05% 0.04% -0.01%
3 2025-07-14 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-20137

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.7 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 1.4 [email protected]

Weakness enumeration for CVE-2025-20137

Affected software / configurations for CVE-2025-20137

Vendor Product Version Raw CPE
cisco ios 15.2\(5a\)e cpe:2.3:o:cisco:ios:15.2\(5a\)e:*:*:*:*:*:*:*
cisco ios 15.2\(5b\)e cpe:2.3:o:cisco:ios:15.2\(5b\)e:*:*:*:*:*:*:*
cisco ios 15.2\(5c\)e cpe:2.3:o:cisco:ios:15.2\(5c\)e:*:*:*:*:*:*:*
cisco ios 15.2\(6\)e cpe:2.3:o:cisco:ios:15.2\(6\)e:*:*:*:*:*:*:*
cisco ios 15.2\(6\)e0c cpe:2.3:o:cisco:ios:15.2\(6\)e0c:*:*:*:*:*:*:*
cisco ios 15.2\(6\)e1 cpe:2.3:o:cisco:ios:15.2\(6\)e1:*:*:*:*:*:*:*
cisco ios 15.2\(6\)e2 cpe:2.3:o:cisco:ios:15.2\(6\)e2:*:*:*:*:*:*:*
cisco ios 15.2\(6\)e2b cpe:2.3:o:cisco:ios:15.2\(6\)e2b:*:*:*:*:*:*:*
cisco ios 15.2\(6\)e3 cpe:2.3:o:cisco:ios:15.2\(6\)e3:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e cpe:2.3:o:cisco:ios:15.2\(7\)e:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e0a cpe:2.3:o:cisco:ios:15.2\(7\)e0a:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e0s cpe:2.3:o:cisco:ios:15.2\(7\)e0s:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e1 cpe:2.3:o:cisco:ios:15.2\(7\)e1:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e1a cpe:2.3:o:cisco:ios:15.2\(7\)e1a:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e2 cpe:2.3:o:cisco:ios:15.2\(7\)e2:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e3 cpe:2.3:o:cisco:ios:15.2\(7\)e3:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e3k cpe:2.3:o:cisco:ios:15.2\(7\)e3k:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e4 cpe:2.3:o:cisco:ios:15.2\(7\)e4:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e5 cpe:2.3:o:cisco:ios:15.2\(7\)e5:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e6 cpe:2.3:o:cisco:ios:15.2\(7\)e6:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e7 cpe:2.3:o:cisco:ios:15.2\(7\)e7:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e8 cpe:2.3:o:cisco:ios:15.2\(7\)e8:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e9 cpe:2.3:o:cisco:ios:15.2\(7\)e9:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e10 cpe:2.3:o:cisco:ios:15.2\(7\)e10:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e11 cpe:2.3:o:cisco:ios:15.2\(7\)e11:*:*:*:*:*:*:*
cisco ios 15.2\(7\)e12 cpe:2.3:o:cisco:ios:15.2\(7\)e12:*:*:*:*:*:*:*
cisco ios 15.2\(7a\)e0b cpe:2.3:o:cisco:ios:15.2\(7a\)e0b:*:*:*:*:*:*:*
cisco ios 15.2\(7b\)e0b cpe:2.3:o:cisco:ios:15.2\(7b\)e0b:*:*:*:*:*:*:*
cisco ios 15.2\(8\)e cpe:2.3:o:cisco:ios:15.2\(8\)e:*:*:*:*:*:*:*
cisco ios 15.2\(8\)e1 cpe:2.3:o:cisco:ios:15.2\(8\)e1:*:*:*:*:*:*:*
cisco ios 15.2\(8\)e2 cpe:2.3:o:cisco:ios:15.2\(8\)e2:*:*:*:*:*:*:*
cisco ios 15.2\(8\)e3 cpe:2.3:o:cisco:ios:15.2\(8\)e3:*:*:*:*:*:*:*
cisco ios 15.2\(8\)e4 cpe:2.3:o:cisco:ios:15.2\(8\)e4:*:*:*:*:*:*:*
cisco ios 15.2\(8\)e5 cpe:2.3:o:cisco:ios:15.2\(8\)e5:*:*:*:*:*:*:*
cisco ios 15.2\(8\)e6 cpe:2.3:o:cisco:ios:15.2\(8\)e6:*:*:*:*:*:*:*

References for CVE-2025-20137

cvelogic Threat Intelligence