How severe is CVE-2025-20137?

CVE-2025-20137 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-20137 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-20137?

CVE-2025-20137 primarily affects Cisco Ios. In total, 35 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-20137?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-20137 have an EU (EUVD) identifier?

Yes. CVE-2025-20137 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13909.

When was CVE-2025-20137 published?

CVE-2025-20137 was published on 2025-05-07 and last updated on 2026-06-17.

CVE-2025-20137

CVE-2025-20137 is a medium-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 4.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-13909
Weakness: CWE-284
Affected product: Cisco Ios
Published: 2025-05-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-20137?: CVE-2025-20137 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-20137 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-20137?: CVE-2025-20137 primarily affects Cisco Ios. In total, 35 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-20137?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-20137 have an EU (EUVD) identifier?: Yes. CVE-2025-20137 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13909.
When was CVE-2025-20137 published?: CVE-2025-20137 was published on 2025-05-07 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipsgacl-pg6qfZk

Affected products (35)

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

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