Vulnerability · Published Oct 30, 2025 · Assigned by VulnCheck

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

High 8.7

In plain English

A high-severity security flaw in Log Server from Nagios. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities).

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.7%top 45.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Nagios	Log Server	0 – before 2024R2.0.2

Weakness: CWE-319 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://www.nagios.com/products/security/#log-server-2024R2 vendor-advisory, patch
https://www.nagios.com/changelog/#log-server release-notes, patch
https://www.vulncheck.com/advisories/nagios-log-server-cluster-manager-credential-requests-sent-over-plaintext third-party-advisory