CVE-2020-1259: Microsoft Windows 10

Medium severity, CVSS 4.3. EPSS: 3.1% chance of exploitation in the next 30 days.

A security feature bypass vulnerability exists when Windows Host Guardian Service improperly handles hashes recorded and logged, aka 'Windows Host Guardian Service Security Feature Bypass Vulnerability'.

Affected products

• Microsoft Windows 10: affected versions not specified; version 1607 only; version 1709 only; version 1809 only; version 1903 only; version 1909 only; …
• Microsoft Windows Server 2016: affected versions not specified; version 1803 only; version 1903 only; version 1909 only; version 2004 only
• Microsoft Windows Server 2019: affected versions not specified

Published 2020-06-09. Last modified 2026-06-17.