SB2025092539 - Denial of service in Cisco IOS XE Software for Catalyst 9000 Series Switches
Published: September 25, 2025
Security Bulletin ID
SB2025092539
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Data Handling (CVE-ID: CVE-2025-20311)
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.
Remediation
Install update from vendor's website.