CVE-2025-34271Network attack vector

Credential interception via plaintext cluster-manager requests

Published Oct 30, 2025 · Updated Nov 17, 2025

Cleartext transmission in Nagios Log Server before 2024R2.0.2 allows man-in-the-middle attackers to intercept cluster credentials. The cluster manager requests sensitive credentials from peer nodes over an unencrypted channel even when product-level SSL/TLS is enabled. Network-path access is required; captured credentials permit authentication as a cluster node or service account and associated unauthorized access.

CVSS severity8.7
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in Nagios Log Server before 2024R2.0.2 allows man-in-the-middle attackers to intercept cluster credentials. The cluster manager requests sensitive credentials from peer nodes over an unencrypted channel even when product-level SSL/TLS is enabled. Network-path access is required; captured credentials permit authentication as a cluster node or service account and associated unauthorized access.

The record

CVE
CVE-2025-34271
Published
Oct 30, 2025
Updated
Nov 17, 2025
Vendor
Nagios Enterprises, LLC
Product
Nagios Log Server
Classifications
CWE-319, CAPEC-117, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2024R2.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nagios Enterprises, LLC · Nagios Log Serverversion=0 <2024R2.0.2

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
CAPEC-117Interception
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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