What’s Vulnerable › Vulnerabilities

CVE-2025-34271: Nagios Log Server < 2024R2.0.2 Cluster Manager Credential Requests Sent Over Plaintext

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-30 · updated 2026-10-07
• Weakness: CWE-319

Description

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; 2024-r1, 2024-r1.0.1, 2024-r1.0.2, 2024-r1.1, 2024-r1.2, 2024-r1.3 (+7) — fixed in 2024

How to fix

Upgrade to a fixed version: Nagios Log Server 2024. Check the vendor advisory for mitigations.

References

• https://www.nagios.com/changelog/#log-server
• https://www.nagios.com/products/security/#log-server-2024R2
• https://www.vulncheck.com/advisories/nagios-log-server-cluster-manager-credential-requests-sent-over-plaintext

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