CVE-2021-34471: Microsoft Malware Protection Engine

High severity, CVSS 7.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Microsoft Defender Elevation of Privilege Vulnerability

Affected products

• Microsoft Malware Protection Engine: before 1.1.18400.4 (fixed in 1.1.18400.4)

Published 2021-08-12. Last modified 2026-08-10.