Vulnerability in Nagios Xi
CVE-2025-34287
Nagios XI versions prior to 2024R2 contain an improperly owned script, process_perfdata.pl, which is executed periodically as the nagios user but owned by www-data. Because the file was writable by www-data, an attacker with web server privileges could modify its contents, leading to arbitrary code execution as the nagios user when the script is next run. This improper ownership and permission configuration enables local privilege escalation.
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 (17.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.2% 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
Weakness classification (CWE)
References
- www.nagios.com/changelog/nagios-xi/ (release-notes, Release Notes, patch)
- www.vulncheck.com/advisories/nagios-xi-privilege-escalation-via-improperly-owne… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2025-34287?
- CVE-2025-34287 is a high-severity vulnerability in Nagios Xi, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2025-10-30.
- How severe is CVE-2025-34287?
- High severity. CVSS v3 base score is 7.8 out of 10.