Arbitrary file upload in Nagios Xi
CVE-2020-36863
Nagios XI versions prior to 5.7.2 allow PHP files to be uploaded to the Audio Import directory and executed from that location. The upload handler did not properly restrict file types or enforce storage outside of the webroot, and the web server permitted execution within the upload directory. An authenticated attacker with access to the audio import feature could upload a crafted PHP file and then request it to achieve remote code execution with the privileges of the application service.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.013 (69.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · 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-unrestricted-file-upload-via-audio-impor… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2020-36863?
- CVE-2020-36863 is a high-severity vulnerability in Nagios Xi, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2025-10-30.
- How severe is CVE-2020-36863?
- High severity. CVSS v3 base score is 8.8 out of 10.