PatchSiren

PatchSiren cyber security CVE debrief

CVE-2021-38649 Microsoft CVE debrief

CVE-2021-38649 is a Microsoft Open Management Infrastructure (OMI) privilege escalation vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2021-11-03. Because it is on the KEV list, defenders should treat it as a high-priority remediation item and follow vendor update guidance promptly. The supplied source corpus does not include a CVSS score or deeper technical advisory details, so the safest actionable guidance is to patch according to Microsoft’s instructions and verify exposure across environments using OMI.

Vendor
Microsoft
Product
Open Management Infrastructure (OMI)
CVSS
HIGH 7
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Security teams, system and platform administrators, and vulnerability management owners responsible for Microsoft OMI deployments should treat this as urgent, especially if they track KEV items or have remediation SLAs tied to CISA due dates.

Technical summary

The available sources identify CVE-2021-38649 as a privilege escalation issue in Microsoft Open Management Infrastructure (OMI). CISA’s KEV entry indicates the vulnerability is known to be exploited and instructs defenders to apply updates per vendor instructions. No CVSS score, exploit mechanics, affected configurations, or impact scope beyond privilege escalation are provided in the supplied corpus.

Defensive priority

High. The KEV listing makes this a time-sensitive remediation item. The supplied timeline shows a CISA add date of 2021-11-03 and a due date of 2021-11-17, so organizations should prioritize patching and verification ahead of any internal SLA that is less strict than the KEV deadline.

Recommended defensive actions

  • Apply Microsoft updates for OMI as directed by the vendor.
  • Inventory systems that include Microsoft Open Management Infrastructure (OMI) and confirm patch status.
  • Treat this CVE as a KEV-driven remediation item and align response with the CISA due date of 2021-11-17.
  • Validate that remediation completed successfully and document any systems that could not be updated immediately.
  • Monitor vendor and CISA guidance for any additional mitigation or follow-up information.

Evidence notes

Supported facts are limited to the supplied CVE metadata and CISA KEV source item. The corpus identifies the issue as a Microsoft OMI privilege escalation vulnerability, lists it in CISA’s Known Exploited Vulnerabilities catalog, and provides the remediation note: “Apply updates per vendor instructions.” No CVSS score, exploit chain details, or vendor advisory text were included in the supplied materials.

Sources and references

Verified primary and authoritative sources

  • CVE-2021-38649 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2021-38649

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

  • CVE-2021-38649 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2021-38649

    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.