CVE-2025-21397: Microsoft 365 Apps

High severity, CVSS 7.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Microsoft Office Remote Code Execution Vulnerability

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Office Long Term Servicing Channel: version 2021 only; version 2024 only

Published 2025-02-11. Last modified 2026-06-17.