CVE-2021-28451: Microsoft 365 Apps

High severity, CVSS 7.8. EPSS: 2.3% chance of exploitation in the next 30 days.

Microsoft Excel Remote Code Execution Vulnerability

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Excel: version 2013 only; version 2016 only
• Microsoft Office: version 2019 only
• Microsoft Office Online Server: affected versions not specified
• Microsoft Office Web Apps Server: version 2013 only

Published 2021-04-13. Last modified 2026-06-17.