What’s Vulnerable › Vulnerabilities

CVE-2020-1259

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-09 · updated 2026-06-17

Description

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 Version 1607: 1607, 1709, 1809, 1903, 1909, 2004
• Microsoft Windows Server 2016: 1803, 1903, 1909, 2004
• Microsoft Windows Server 2019: all versions
• Microsoft Corporation Windows: 10 Version 1803 for 32-bit Systems, 10 Version 1803 for x64-based Systems, 10 Version 1803 for ARM64-based Systems, 10 Version 1809 for 32-bit Systems, 10 Version 1809 for x64-based Systems, 10 Version 1809 for ARM64-based Systems (+7)
• Microsoft Windows 10 Version 1903 for 32-bit Systems: all versions
• Microsoft Windows 10 Version 1903 for ARM64-based Systems: all versions
• Microsoft Windows 10 Version 1903 for x64-based Systems: all versions
• Microsoft Windows 10 Version 1909 for 32-bit Systems: all versions
• Microsoft Windows 10 Version 1909 for ARM64-based Systems: all versions
• Microsoft Windows 10 Version 1909 for x64-based Systems: all versions
• Microsoft Windows 10 Version 2004 for 32-bit Systems: all versions
• Microsoft Windows 10 Version 2004 for ARM64-based Systems: all versions
• Microsoft Windows 10 Version 2004 for x64-based Systems: all versions
• Microsoft Windows Server: version 1803 (Core Installation), 2019, 2019 (Core installation), 2016, 2016 (Core installation)
• Microsoft Windows Server, version 1903 (Server Core installation): all versions
• Microsoft Windows Server, version 1909 (Server Core installation): all versions
• Microsoft Windows Server version 2004: all versions

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1259
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1259

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