SB2025082818 - Denial of service in Cisco Nexus 3000 and 9000 Series Switches
Published: August 28, 2025
Security Bulletin ID
SB2025082818
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) Compiler Optimization Removal or Modification of Security-critical Code (CVE-ID: CVE-2025-20241)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input in the Intermediate System-to-Intermediate System (IS-IS) feature. A remote attacker on the local network can send a specially crafted IS-IS packet and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.