CVE-2021-25299

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 97.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-02-15 · updated 2026-07-09
Weakness: CWE-79

Description

Nagios XI version xi-5.7.5 is affected by cross-site scripting (XSS). The vulnerability exists in the file /usr/local/nagiosxi/html/admin/sshterm.php due to improper sanitization of user-controlled input. A maliciously crafted URL, when clicked by an admin user, can be used to steal his/her session cookies or it can be chained with the previous bugs to get one-click remote command execution (RCE) on the Nagios XI server.

Affected products

Nagios XI: 5.7.5

References

http://packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Execution.html
https://assets.nagios.com/downloads/nagiosxi/versions.php
https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md
http://packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Execution.html
https://assets.nagios.com/downloads/nagiosxi/versions.php
https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md

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