PatchSiren

PatchSiren cyber security CVE debrief

CVE-2021-25298 Nagios CVE debrief

CVE-2021-25298 affects Nagios XI and is identified by CISA as a known exploited vulnerability. The official guidance in the supplied corpus is to apply updates per vendor instructions, making this a high-priority defensive item for any environment running Nagios XI.

Vendor
Nagios
Product
Nagios XI
CVSS
HIGH 8.8
CISA KEV
Listed
Original CVE published
2022-01-18
Original CVE updated
2022-01-18
Advisory published
2022-01-18
Advisory updated
2022-01-18

Who should care

Administrators, security teams, and incident responders responsible for Nagios XI deployments should prioritize this CVE, especially because it is listed in CISA’s Known Exploited Vulnerabilities catalog.

Technical summary

The supplied official sources describe CVE-2021-25298 as an OS command injection issue in Nagios XI. CISA has marked it as known exploited, and the KEV entry directs defenders to apply updates per vendor instructions. The supplied corpus does not include deeper technical details, proof-of-concept information, or affected version ranges.

Defensive priority

High. CISA’s KEV inclusion indicates confirmed exploitation risk, so remediation should be treated as urgent and tracked to completion.

Recommended defensive actions

  • Identify all Nagios XI instances in your environment and confirm which are exposed or externally reachable.
  • Apply the vendor-recommended update or mitigation path referenced by Nagios and CISA as soon as possible.
  • Prioritize remediation before the KEV due date of 2022-02-01 for any unpatched instance still in service.
  • Verify post-update status and monitor for signs of command-injection abuse or unexpected administrative activity.
  • If immediate patching is not possible, place compensating controls around access to the Nagios XI interface and document the exception.

Evidence notes

This debrief is based only on the supplied official records: the CVE record, NVD detail page, and CISA KEV catalog entry. The corpus explicitly identifies the issue as Nagios XI OS command injection and marks it as known exploited. No CVSS score, affected-version list, exploit details, or remediation specifics beyond "apply updates per vendor instructions" were provided in the source corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-25298 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-25298

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2021-25298 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-25298

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.