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
EPSS: 0.013 (67.2th percentile) — read the EPSS interpretation.
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.
Affected products
- Nagios Nagios_xi
- Nagios Xi — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (release-notes, Release Notes, patch)
- disclosure@vulncheck.com (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.