CVE-2023-21809: Microsoft Defender Security Intelligence Updates

High severity, CVSS 7.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Microsoft Defender for Endpoint Security Feature Bypass Vulnerability

Affected products

• Microsoft Defender Security Intelligence Updates: before 1.379.200.0 (fixed in 1.379.200.0)

Published 2023-02-14. Last modified 2026-08-19.