Compiler Optimization Removal or Modification of Security-critical Code in Cisco Systems, Inc products - CVE-2025-20241

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Main Vulnerability Database Vulnerabilities #VU114486

Compiler Optimization Removal or Modification of Security-critical Code in Cisco Systems, Inc products - CVE-2025-20241

Published: August 28, 2025


Vulnerability identifier: #VU114486
CSH Severity: Medium
CVSS v4: 6.3 [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]
CVE-ID: CVE-2025-20241
CWE-ID: CWE-733
Exploitation vector: Adjecent network
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

Cisco Nexus 9000 Series Switches
Cisco Nexus 3000 Series Switches
Cisco NX-OS

How to mitigate CVE-2025-20241

Install updates from vendor's website.

Cisco NX-OS - addressed in versions 9.3(15), 10.2(9), 10.3(7), 10.3(8), 10.4(5), 10.6(1)

External References

Related Security Bulletins