Vulnerability in Nagios Log Server
CVE-2025-34323
Nagios Log Server versions prior to 2026R1.0.1 are vulnerable to local privilege escalation due to a combination of sudo misconfiguration and group-writable application directories. The 'www-data' user is a member of the 'nagios' group, which has write access to '/usr/local/nagioslogserver/scripts', while several scripts in this directory are owned by root and may be executed via sudo without a password. A local attacker running as 'www-data' can move one of these root-owned scripts to a backup name and create a replacement script with attacker-controlled content at the original path, then invoke it with sudo. This allows arbitrary commands to be executed with root privileges, providing full compromise of the underlying operating system.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (23.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Nagios Log Server — versions 0
- Nagios Log Server — versions 2026
Weakness classification (CWE)
References
- www.nagios.com/products/security/ (vendor-advisory, patch, Vendor Advisory)
- www.nagios.com/changelog/nagios-log-server/nagios-log-server-2026r1-0-1/ (release-notes, Release Notes, patch)
- www.vulncheck.com/advisories/nagios-log-server-local-privilege-escalation-via-w… (Third Party Advisory, third-party-advisory)
- theyhack.me/Rooting-Nagios-Log-Server/ (technical-description, exploit)
Frequently asked questions
- What is CVE-2025-34323?
- CVE-2025-34323 is a high-severity vulnerability in Nagios Log Server, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2025-11-17.
- How severe is CVE-2025-34323?
- High severity. CVSS v3 base score is 7.8 out of 10.