SB2025082818 - Denial of service in Cisco Nexus 3000 and 9000 Series Switches

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Main Vulnerability Database SB2025082818

SB2025082818 - Denial of service in Cisco Nexus 3000 and 9000 Series Switches

Published: August 28, 2025

Security Bulletin ID SB2025082818
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Compiler Optimization Removal or Modification of Security-critical Code (CVE-ID: CVE-2025-20241)

CWE-ID: CWE-733 - Compiler Optimization Removal or Modification of Security-critical Code

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H/E:U/U:Green


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.

References