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PatchSiren cyber security CVE debrief

CVE-2021-25296 Nagios CVE debrief

CVE-2021-25296 is an OS command injection vulnerability in Nagios XI. CISA added it to the Known Exploited Vulnerabilities catalog on 2022-01-18, which means defenders should treat it as actively exploited risk and prioritize remediation. The source corpus indicates the required action is to apply updates per vendor instructions, with a CISA due date of 2022-02-01.

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

Nagios XI administrators, security operations teams, vulnerability management teams, and any organization running internet-facing or broadly accessible Nagios XI instances should prioritize this issue.

Technical summary

The vulnerability is identified as an OS command injection in Nagios XI. In defensive terms, command injection flaws can let an attacker cause the application to execute unintended operating-system commands. The provided source set does not include affected version ranges, attack preconditions, or vendor-specific exploit details, so remediation guidance should be limited to patching and validation using official vendor instructions.

Defensive priority

High. CISA placed this CVE in the Known Exploited Vulnerabilities catalog on 2022-01-18 and set a remediation due date of 2022-02-01, indicating prompt action is warranted.

Recommended defensive actions

  • Apply the vendor-provided updates and mitigation guidance for Nagios XI as soon as possible.
  • Inventory all Nagios XI deployments, including non-production and externally reachable instances, so none are missed.
  • Verify patch status after remediation and confirm the vulnerable deployment is no longer present.
  • Review logs and alerts for unusual command execution or unexpected process activity around Nagios XI hosts.
  • Use the CISA Known Exploited Vulnerabilities catalog as a prioritization input for vulnerability management and remediation tracking.

Evidence notes

This debrief is based on the supplied CISA KEV source item and the official CVE/NVD reference links provided in the corpus. The corpus identifies the issue as 'Nagios XI OS Command Injection,' marks it as a known exploited vulnerability, and supplies the KEV date-added and due-date fields. No vendor advisory text, affected-version range, CVSS score, or exploitation details beyond the KEV classification were included.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-25296 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-25296

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

  • CVE-2021-25296 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-25296

    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.