SB2025092544 - Improper access control in Cisco IOS XE Software on Cisco Catalyst 9500X and 9600X Series Switches
Published: September 25, 2025
Security Bulletin ID
SB2025092544
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper access control (CVE-ID: CVE-2025-20316)
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.
Remediation
Install update from vendor's website.