CVE-2025-20137A vulnerability in the access control list (ACL) programming of Cisco IOS Software that is running on Cisco Catalyst 1000 Switches and…
- 4.7MediumCVSS base score
- 0.29%Exploitation in 30 daysEPSS · top 79% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By cisco
- 7 months later
· 7 months later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium4.7 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
| NVDNVD · Analyzed | 3.1 | Medium4.7 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.29% · top 79% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.7.
Affected products
- affected 15.2(5a)E
- affected 15.2(5b)E
- affected 15.2(5c)E
- affected 15.2(6)E
- affected 15.2(6)E1
- affected 15.2(6)E0c
- affected 15.2(6)E2
- affected 15.2(7)E
- affected 15.2(6)E2b
- affected 15.2(7)E1
- affected 15.2(7)E0a
- affected 15.2(7)E0s
- affected 15.2(6)E3
- affected 15.2(7)E2
- affected 15.2(7a)E0b
- affected 15.2(7)E3
- affected 15.2(7)E1a
- affected 15.2(7b)E0b
- affected 15.2(7)E4
- affected 15.2(7)E3k
- affected 15.2(8)E
- affected 15.2(8)E1
- affected 15.2(7)E5
- affected 15.2(7)E6
- affected 15.2(8)E2
- affected 15.2(7)E7
- affected 15.2(8)E3
- affected 15.2(7)E8
- affected 15.2(8)E4
- affected 15.2(7)E9
- affected 15.2(8)E5
- affected 15.2(8)E6
- affected 15.2(7)E10
- affected 15.2(7)E11
- affected 15.2(7)E12
What to do
Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-13909 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-20137)Record last updated .