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CVE-2021-25298

8.8, high Known exploited

Nagios XI OS Command Injection

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
8.8, high high CVSS v3.1
EPSS, next 30 days
74% higher than 99.4% of scored CVEs
Exploitation
Confirmed in the wild
Published
15 Feb 20215 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 18 Jan 2022. US federal agencies had to remediate by 1 Feb 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

Description

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.

Details

Vendor
Nagios
Product
Nagios Xi
Weakness
CWE-78 (opens in a new tab)
Status
Analyzed
Updated
9 Jul 2026
Assigner
cve@mitre.org

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

References 6

Exploit code 4

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Nagios CVEs

Every Nagios CVE we hold

Same vendor in what we hold, not a known link between the flaws.

Beyond this page

Is CVE-2021-25298 in your network?

This page tells you how dangerous CVE-2021-25298 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2021-25298 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

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    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2021-25298 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 16 Oct 2026, not the live upstream state.