CVE-2021-38646: Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

High severity, CVSS 7.8. Actively exploited: in CISA KEV since 2022-03-28. EPSS: 8% chance of exploitation in the next 30 days.

Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

Affected products

  • Microsoft 365 Apps: affected versions not specified
  • Microsoft Office: version 2013 only
  • Microsoft Office 2016: affected versions not specified
  • Microsoft Office 2019: affected versions not specified

Published 2021-09-15. Last modified 2026-08-10.