CVE-2021-31985: Microsoft Malware Protection Engine

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

Microsoft Defender Remote Code Execution Vulnerability

Affected products

• Microsoft Malware Protection Engine: before 1.1.18200.3 (fixed in 1.1.18200.3)

Published 2021-06-08. Last modified 2026-06-17.