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Cyber Threat
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HIGH · CVSS 8.8 CISA Known Exploited Vulnerability

CVE-2021-25296

Nagios XI OS Command Injection

Nagios XI

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
EPSS
71.9%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
15 Feb 2021
NVD

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 18 January 2022. US federal agencies were required to remediate it by 1 February 2022.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 71.9%, which is higher than 99.4% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

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

Frequently asked questions

Is CVE-2021-25296 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2021-25296.

What does CVE-2021-25296 affect?

CVE-2021-25296 affects Nagios XI. 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.

How severe is CVE-2021-25296?

CVE-2021-25296 is rated HIGH with a CVSS base score of 8.8. EPSS puts the probability of exploitation in the next 30 days at 71.9%, higher than 99.4% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 1 February 2022.

How should organisations respond to CVE-2021-25296?

Apply the vendor patch for Nagios XI as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.