CVE-2021-25297 Nagios CVE debrief

Who should care

Nagios XI administrators, security teams, and asset owners responsible for exposed or business-critical Nagios deployments should prioritize this CVE, especially where patching is delayed or remediation tracking is incomplete.

Technical summary

The supplied source corpus identifies the issue as an OS command injection affecting Nagios XI. The available official references confirm the CVE record and that CISA considers it a known exploited vulnerability. No additional technical details, affected version ranges, or CVSS data are provided in the supplied corpus.

Defensive priority

High. CISA KEV inclusion indicates known exploitation and a time-sensitive remediation requirement. The KEV entry lists a due date of 2022-02-01, so affected environments should be reviewed and updated immediately if still unremediated.

Recommended defensive actions

• Apply vendor-provided updates or mitigations for Nagios XI as instructed by the vendor.
• Inventory all Nagios XI instances to confirm whether any deployed systems are affected.
• Prioritize remediation for internet-facing or operationally critical monitoring servers.
• Verify completion of patching and document the remediation status for vulnerability management tracking.

Evidence notes

CISA’s Known Exploited Vulnerabilities catalog entry names the issue as “Nagios XI OS Command Injection,” marks it as a known exploited vulnerability, and provides a required action to apply updates per vendor instructions. The CVE and NVD official records are included as authoritative reference links in the source corpus. The corpus does not provide CVSS metrics or affected-version detail.

Official resources