CVE-2021-42298: Microsoft Malware Protection Engine

High severity, CVSS 7.8. EPSS: 5.8% chance of exploitation in the next 30 days.

Microsoft Defender Remote Code Execution Vulnerability

Affected products

• Microsoft Malware Protection Engine: before 1.1.18700.3 (fixed in 1.1.18700.3)

Published 2021-11-10. Last modified 2026-08-19.