CVE-2021-25298
Nagios XI OS Command Injection
What the flaw is
Nagios XI contains a vulnerability which can lead to OS command injection on the Nagios XI server.
Description as published by CISA. We have not independently reproduced it.
What CISA requires
Apply updates per vendor instructions.
This deadline is binding on US federal civilian agencies under BOD 22-01. It is not a legal deadline for anyone else, but it is a useful urgency signal — CISA sets it by how actively the flaw is being used, not by CVSS.
Public exploit code
6 public repositories referencing this CVE have been catalogued on GitHub. Treat this as a strong signal to prioritise patching, not as a verified working exploit — many such repositories are scanners, write-ups or forks rather than functional code.
Vendor advisories
Primary sources
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Other Nagios entries
See allSource: CISA KEV catalog · last verified August 6, 2026. Rebuilt automatically twice a day.