Data Handling in Cisco Systems, Inc products - CVE-2025-20311
Published: September 25, 2025
Vulnerability identifier: #VU116112
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2025-20311
CWE-ID: CWE-19
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco IOS XE
Catalyst 9200 Series Switches
Catalyst 9300 Series Switches
Catalyst 9400 Series Switches
Catalyst 9500 Series Switches
Catalyst 9600 Series Switches
Cisco IOS XE
Catalyst 9200 Series Switches
Catalyst 9300 Series Switches
Catalyst 9400 Series Switches
Catalyst 9500 Series Switches
Catalyst 9600 Series Switches
Detailed vulnerability description
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.
How to mitigate CVE-2025-20311
Install update from vendor's website.