CVE-2021-25296

KEVNagios XI OS Command Injection

Description

Nagios XI contains a vulnerability which can lead to OS command injection on the Nagios XI server.

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/windowswmi/windowswmi.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.

CVSS 3.1 vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

PublishedFeb 15, 2021

Last modifiedJul 9, 2026

Added to KEVJan 18, 2022

Remediation dueFeb 1, 2022

References

packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Execution.htmlExploitThird Party Advisory
packetstormsecurity.com/files/170924/Nagios-XI-5.7.5-Remote-Code-Execution.htmlThird Party AdvisoryVDB Entry
assets.nagios.com/downloads/nagiosxi/versions.phpProduct
github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.mdExploitThird Party Advisory
fastly.com/blog/anatomy-of-a-command-injection-cve-2021-25296-7-8-with-metasploit-module-andExploitThird Party Advisory
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-25296US Government Resource

0 recent articles mention this CVE

Risk assessment · Critical

Actively exploited. Patch immediately.

Exploitation: Confirmed in the wild (CISA KEV)
Federal remediation deadline: Overdue by 1728 days
CVSS: 8.8 HIGH
EPSS (30-day exploit probability): 71.9% · top 1% of all CVEs
Weakness: NVD-CWE-Other
Attack vector: Network, remotely reachable

Recommended actions

1.Apply updates per vendor instructions.
2.Treat as emergency change: patch or isolate internet-facing instances first.
3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

Assessment is derived automatically from the live signals above; verify against your own asset inventory.