CVE-2021-38647

Critical (9.8) in Microsoft Open Management Infrastructure (OMI). In CISA KEV since 2021-11-03, with known ransomware use. EPSS 100% chance of exploitation in the next 30 days.

EPSS

100% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)

CISA KEV

listed 2021-11-03, due 2021-11-17, known ransomware use

Published

2021-09-15

Modified

2026-08-10

Record from

the NVD, synced 2026-10-19

Affected

• microsoft:azure_automation_state_configuration
• microsoft:azure_automation_update_management
• microsoft:azure_diagnostics_\(lad\)
• microsoft:azure_security_center
• microsoft:azure_sentinel
• microsoft:azure_stack_hub
• microsoft:container_monitoring_solution
• microsoft:log_analytics_agent
• microsoft:open_management_infrastructure
• microsoft:system_center_operations_manager

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38647
• http://packetstormsecurity.com/files/164694/Microsoft-OMI-Management-Interface-Authentication-Bypass.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38647
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-38647

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