CVE-2020-0645

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-03-12 · updated 2026-06-17

Description

A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.

Affected products

Microsoft Windows 10 Version 1607: 1607, 1709, 1803, 1809, 1903, 1909
Microsoft Windows 7: all versions
Microsoft Windows 8.1: all versions
Microsoft Windows RT 8.1: all versions
Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: 1803, 1903, 1909
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 (+12)
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 Server: version 1803 (Core Installation), 2019, 2019 (Core installation), 2016, 2016 (Core installation), 2008 for 32-bit Systems Service Pack 2 (+11)
Microsoft Windows Server, version 1903 (Server Core installation): all versions
Microsoft Windows Server, version 1909 (Server Core installation): all versions

References

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