CVE-2020-36863CWE-434unrestricted-file-upload

CVE-2020-36863

High · published October 31, 2025

CVSS v3.1
8.8
EPSS
1%
Percentile
71.9
In the wild
Unconfirmed
What it is

⚡ A crafty upload vulnerability lurking in Nagios XI could let an attacker execute PHP files with a simple audio import! 🔥 Think of it like a radio station allowing guests to drop off their own recordings without checking the content — if they slip in a rogue track, it could play havoc on air! In this case, an attacker can upload malicious PHP scripts that the server will execute right from the Audio Import directory. An attacker with access to the audio import feature could upload a crafted PHP file and trigger it to execute, gaining remote code execution with the application service privileges. This could lead to unauthorized access to sensitive data, system manipulation, or even a complete takeover of the server. The consequences could be absolutely devastating!

Put simply

Think of it like a radio station allowing guests to drop off their own recordings without checking the content — if they slip in a rogue track, it could play havoc on air! In this case, an attacker can upload malicious PHP scripts that the server will execute right from the Audio Import directory. This vulnerability in Nagios XI versions prior to 5.7.2 allows an attacker to upload PHP files to the Audio Import directory without proper file type restrictions, enabling execution of these files directly from the web server.

What to do

An attacker with access to the audio import feature could upload a crafted PHP file and trigger it to execute, gaining remote code execution with the application service privileges. This could lead to unauthorized access to sensitive data, system manipulation, or even a complete takeover of the server. The consequences could be absolutely devastating! Immediately upgrade Nagios XI to version 5.7.2 or later to close this vulnerability. Additionally, review the upload handling processes to ensure only safe file types are allowed and enforce storage outside of the webroot to prevent execution. You’ve got this! Follow these steps, and you'll secure your system in no time! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01378 · 71.9th percentile
Weakness
CWE-434 · Unrestricted Upload of File with Dangerous Type
Published
2025-10-31T02:15Z
Affected products (1)
ProductVersionsFixed in
nagios/nagios_xi< 5.7.25.7.2
References (2)
EPSS history
Timeline
  • 30 OCT 21:46Z
    Nagios XI < 5.7.2 Unrestricted File Upload via Audio Import Directory
    cvelistv5