CVE-2025-34284: Nagios XI

High severity, CVSS 8.8. EPSS: 4% chance of exploitation in the next 30 days.

Nagios XI versions prior to 2024R2 contain a command injection vulnerability in the WinRM plugin. Insufficient validation of user-supplied parameters allows an authenticated administrator to inject shell metacharacters that are incorporated into backend command invocations. Successful exploitation enables arbitrary command execution with the privileges of the Nagios XI web application user and can be leveraged to modify configuration, exfiltrate data, disrupt monitoring operations, or execute commands on the underlying host operating system.

Affected products

• Nagios Nagios XI: before 2024 (fixed in 2024); version 2024 only

Published 2025-10-30. Last modified 2026-10-07.