CVE-2021-25298 — Nagios XI OS Command Injection

Nagios XI version xi-5.7.5 is affected by OS command injection. The vulnerability exists in the file /usr/local/nagiosxi/html/includes/configwizards/cloud-vm/cloud-vm.inc.php due to improper sanitization of authenticated user-controlled input by a single HTTP request, which can l

01What is this vulnerability?

Nagios XI version xi-5.7.5 is affected by OS command injection. The vulnerability exists in the file /usr/local/nagiosxi/html/includes/configwizards/cloud-vm/cloud-vm.inc.php due to improper sanitization of authenticated user-controlled input by a single HTTP request, which can lead to OS command injection on the Nagios XI server.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-01-18. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

08Timeline

• Published: 2021-02-15T00:00:00.000Z
• Last modified: 2025-10-21T23:35:26.568Z
• Added to CISA KEV: 2022-01-18
• BOD 22-01 due: 2022-02-01

09References

• nagios.com — http://nagios.com
• assets.nagios.com — https://assets.nagios.com/downloads/nagiosxi/versions.php
• github.com — https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md
• packetstormsecurity.com — http://packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Executio…
• packetstormsecurity.com — http://packetstormsecurity.com/files/170924/Nagios-XI-5.7.5-Remote-Code-Executio…
• www.fastly.com — https://www.fastly.com/blog/anatomy-of-a-command-injection-cve-2021-25296-7-8-wi…