Vulnerability in Nagios Xi
CVE-2025-34288
Nagios XI versions prior to 2026R1.1 are vulnerable to local privilege escalation due to an unsafe interaction between sudo permissions and application file permissions. A user‑accessible maintenance script may be executed as root via sudo and includes an application file that is writable by a lower‑privileged user. A local attacker with access to the application account can modify this file to introduce malicious code, which is then executed with elevated privileges when the script is run. Successful exploitation results in arbitrary code execution as the root user.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.019 (78.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.019 · change: +0.000
Affected products
- Nagios Xi — versions 2026
- Nagios Enterprises Xi — versions 0
Weakness classification (CWE)
References
- www.nagios.com/changelog/nagios-xi/2026r1-1/ (release-notes, Release Notes, patch)
- www.vulncheck.com/advisories/nagios-xi-privilege-escalation-via-writable-php-in… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2025-34288?
- CVE-2025-34288 is a medium-severity vulnerability in Nagios Xi, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 6.7/10. Published 2025-12-16.
- How severe is CVE-2025-34288?
- Medium severity. CVSS v3 base score is 6.7 out of 10.