High 8.8Known exploited (CISA KEV)Published Feb 14, 2021

CVE-2021-25296Nagios XI version xi-5.7.5 is affected by OS command injection.

Updated under an hour ago (Oct 27, 2026, 5:40 AM ET)

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It affects nagios_xi. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Jan 18, 2022; federal agencies had to remediate by Feb 1, 2022. Treat that date as your deadline.

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Every CVE for nagios_xi

Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Added to CISA KEV Jan 18, 2022; federal remediation due Feb 1, 2022Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 71.94% (percentile 99)
Assigned by: mitre
NVD analysis: Analyzed
Record last updated: Jul 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nagios nagios_xi nagios:nagios_xi	from 5.5.6 through 5.7.5	NVD

References

References

https://assets.nagios.com/downloads/nagiosxi/versions.php	product
https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md	exploit, third-party-advisory
http://packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Execution.html	exploit, third-party-advisory, vdb-entry
http://packetstormsecurity.com/files/170924/Nagios-XI-5.7.5-Remote-Code-Execution.html	third-party-advisory, vdb-entry
https://www.fastly.com/blog/anatomy-of-a-command-injection-cve-2021-25296-7-8-with-metasploit-module-and	exploit, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-25296	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.