Vulnerability in Nagios Log Server
CVE-2025-34271
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Nagios Log Server — versions 0
- Nagios Log Server — versions 2024
Weakness classification (CWE)
References
- www.nagios.com/products/security/ (vendor-advisory, patch, Vendor Advisory)
- www.nagios.com/changelog/ (release-notes, Release Notes, patch)
- www.vulncheck.com/advisories/nagios-log-server-cluster-manager-credential-reque… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2025-34271?
- CVE-2025-34271 is a critical-severity vulnerability in Nagios Log Server, classified under Cleartext Transmission of Sensitive Information. CVSS score: 9.8/10. Published 2025-10-30.
- How severe is CVE-2025-34271?
- Critical severity. CVSS v3 base score is 9.8 out of 10.