Data Handling in Cisco Systems, Inc products - CVE-2025-20311

 

Data Handling in Cisco Systems, Inc products - CVE-2025-20311

Published: September 25, 2025


Vulnerability identifier: #VU116112
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-20311
CWE-ID: CWE-19
Exploitation vector: Adjecent network
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper handling of crafted Ethernet frames. A remote attacker on the local network can pass specially crafted input to the application and perform a denial of service (DoS) attack.


Affected software

Catalyst 9200 Series Switches
Catalyst 9300 Series Switches
Catalyst 9400 Series Switches
Catalyst 9500 Series Switches
Catalyst 9600 Series Switches
Cisco IOS XE

How to mitigate CVE-2025-20311

Install update from vendor's website.

Cisco IOS XE - addressed in versions Dublin-17.12.5, Cupertino-17.9.7, 17.9.7, 17.9.7a, 17.9.7b, 17.12.4a, 17.12.4b, 17.12.5, 17.12.5c, 17.12.5a, 17.12.5b, 17.12.6, 17.12.6a, 17.15.3, 17.17.1

External References

Related Security Bulletins