CVE-2025-34271

CVE-2025-34271 is a critical-severity vulnerability in Nagios Log Server with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-319.

Key facts

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-34271?
CVE-2025-34271 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-34271 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-34271?
CVE-2025-34271 primarily affects Nagios Log Server. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-34271?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-34271 have an EU (EUVD) identifier?
Yes. CVE-2025-34271 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37222.
When was CVE-2025-34271 published?
CVE-2025-34271 was published on 2025-10-30 and last updated on 2026-06-17.

References

Affected products (14)

More vulnerabilities in Nagios Log Server

All CVEs affecting Nagios Log Server →

Other CWE-319 (Cleartext Transmission of Sensitive Information) vulnerabilities

Browse all CWE-319 (Cleartext Transmission of Sensitive Information) vulnerabilities →