Improper access control in Cisco Systems, Inc products - CVE-2025-20316

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Main Vulnerability Database Vulnerabilities #VU116117

Improper access control in Cisco Systems, Inc products - CVE-2025-20316

Published: September 25, 2025


Vulnerability identifier: #VU116117
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-20316
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to the flooding of traffic from an unlearned MAC address on a switch virtual interface (SVI) that has an egress ACL applied. A remote attacker can bypass an egress ACL on the target device.


Affected software

Catalyst 9500X Series Switches
Catalyst 9600X Series Switches
Cisco IOS XE

How to mitigate CVE-2025-20316

Install updates from vendor's website.

Cisco IOS XE - addressed in versions IOSXE-17.15.4, SDK-25.2.3000.2, SDK-25.4.1000.0, Cupertino-17.9.8, 17.9(7.2), 17.9.8, 17.12(5.2), 17.15(3.3), 17.15.4

External References

Related Security Bulletins