CVE-2025-20137 is an access control bypass vulnerability in Cisco IOS Software affecting Cisco Catalyst 1000 and 2960L Switches. This medium-severity flaw (CVSS 4.7) arises from an unsupported configuration where both an IPv4 ACL and a dynamic IP Source Guard ACL are simultaneously applied to the same interface. An unauthenticated, remote attacker could exploit this by sending traffic through the device, potentially bypassing the configured ACLs. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
15.2\(5a\)eCPE matchmatch criteria | cpe:2.3:o:cisco:ios:15.2\(5a\)e:*:*:*:*:*:*:* | ||
15.2\(5b\)eCPE matchmatch criteria | cpe:2.3:o:cisco:ios:15.2\(5b\)e:*:*:*:*:*:*:* | ||
15.2\(5c\)eCPE matchmatch criteria | cpe:2.3:o:cisco:ios:15.2\(5c\)e:*:*:*:*:*:*:* | ||
15.2\(6\)eCPE matchmatch criteria | cpe:2.3:o:cisco:ios:15.2\(6\)e:*:*:*:*:*:*:* | ||
15.2\(6\)e0cCPE matchmatch criteria | cpe:2.3:o:cisco:ios:15.2\(6\)e0c:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.