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CVE-2025-34271

34
FAUCET Score

CVE-2025-34271 is a critical vulnerability affecting Nagios Log Server versions prior to 2024R2.0.2. It allows an attacker on the network path to intercept sensitive credentials exchanged between cluster nodes over an unencrypted channel, even when SSL/TLS is configured. This vulnerability carries a CVSS score of 9.8 (CRITICAL) due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion, indicating awareness and potential future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 2024CPE matchmatch criteria
cpe:2.3:a:nagios:log_server:*:*:*:*:*:*:*:*
2024CPE matchmatch criteria
cpe:2.3:a:nagios:log_server:2024:r1:*:*:*:*:*:*
2024CPE matchmatch criteria
cpe:2.3:a:nagios:log_server:2024:r1.0.1:*:*:*:*:*:*
2024CPE matchmatch criteria
cpe:2.3:a:nagios:log_server:2024:r1.0.2:*:*:*:*:*:*
2024CPE matchmatch criteria
cpe:2.3:a:nagios:log_server:2024:r1.1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.7HIGH

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
NONE
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.69%
Probability of exploitation in next 30 days
EPSS Percentile
49.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0069 is in the 30th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

nagios.com / changelog
Release Notes
nagios.com / products/security
Vendor Advisory
vulncheck.com / advisories/nagios-log-server-cluster-manager-credential-requests-sent-over-plaintext
Third Party Advisory