CVE-2025-34271: Nagios Log Server

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Nagios Log Server versions prior to 2024R2.0.2 contain a vulnerability in the cluster manager component when requesting sensitive credentials from peer nodes over an unencrypted channel even when SSL/TLS is enabled in the product configuration. As a result, an attacker positioned on the network path can intercept credentials in transit. Captured credentials could allow the attacker to authenticate as a cluster node or service account, enabling further unauthorized access, lateral movement, or system compromise.

Affected products

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

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