CVE-2026-76437 Cisco CVE debrief

Who should care

System administrators and security teams responsible for Cisco License On-Prem installations should assess exposure and prioritize patching or mitigation. This includes reviewing current configurations, updating software versions, and implementing additional security measures to prevent potential system compromise and lateral movement. Security teams should also monitor system logs for suspicious activity and conduct regular security audits and vulner

Why it matters

CVE-2026-76437 is a medium-severity vulnerability in Cisco License On-Prem that allows authenticated remote attackers with administrative credentials to execute arbitrary commands on the underlying operating system with root privileges. System administrators and security teams should assess exposure and prioritize patching or mitigation to prevent potential system compromise and lateral movement.

• Potential system compromise and arbitrary command execution with root privileges.
• Ability to turn off the system, which an administrative user could not normally do.
• Potential lateral movement and exploitation of other vulnerabilities.

Technical summary

A vulnerability in the web-based user interface of Cisco License On-Prem could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system. This vulnerability is due to improper validation of user-supplied content within configurations that are submitted to the web-based management interface. The vulnerability affects multiple versions of Cisco License On-Prem, including versions 1.1, 1.2, 1.3, 1.4, 6.3.0, 7-202001, 8-202001, 8-202004, 8-202006, 8-202008, 8-202010, 8-202012, 8-202102, 8-202105, 8-202108, 8-202112, 8-202201, 8-202206, 8-202212, 8-202302, 8-202303, 8-202304, 8-202308, 8-202401, 8-202404, 9-202201, 9-202406, 9-202407, 9-202410, 9-202412, 9-202501. To be

Defensive priority

High

Recommended defensive actions

• Review and update Cisco License On-Prem configurations to ensure proper validation of user-supplied content.
• Restrict administrative access to the web-based management interface.
• Monitor system logs for suspicious activity.
• Apply patches or updates provided by Cisco as soon as possible.
• Implement additional security measures such as network segmentation and intrusion detection.
• Conduct regular security audits and vulnerability assessments.
• Establish a incident response plan in case of a successful exploit.

Evidence notes

The CVE record and Cisco security advisory provide details on the vulnerability. Cisco License On-Prem versions 1.1, 1.2, 1.3, 1.4, 6.3.0, 7-202001, 8-202001, 8-202004, 8-202006, 8-202008, 8-202010, 8-202012, 8-202102, 8-202105, 8-202108, 8-202112, 8-202201, 8-202206, 8-202212, 8-202302, 8-202303, 8-202304, 8-202308, 8-202401, 8-202404, 9-202201, 9-202406, 9-202407, 9-202410, 9-202412, 9-202501 are affected.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.