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CVE-2025-34271

Nagios Log Server vulnerability

9.8 CRITICALEPSS 0.74%
  1. Published30 Oct 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Nagios Log Server< 2024 · 2024

Remediation

Fixed in
Nagios Log Server≥ 2024

References

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Frequently asked

Is CVE-2025-34271 being actively exploited?

CVE-2025-34271 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.74%.

How severe is CVE-2025-34271?

CVE-2025-34271 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.74% probability of exploitation.

Which products are affected by CVE-2025-34271?

Affected products include Nagios Log Server.

How do I fix CVE-2025-34271?

Upgrade affected software to a fixed version, for example Nagios Log Server 2024 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-34271 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.