HIGH 7.7 Microsoft

CVE-2021-1691

Windows Hyper-V Denial of Service Vulnerability

Microsoft Security Update 2021-Jan: Windows Hyper-V Denial of Service Vulnerability

Affected Products

Windows Server, version 20H2 (Server Core Installation)
Windows 10 Version 1909 for x64-based Systems
Windows Server, version 1909 (Server Core installation)
Windows 10 Version 2004 for x64-based Systems
Windows Server, version 2004 (Server Core installation)

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1691
https://nvd.nist.gov/vuln/detail/CVE-2021-1691

Published: 2021-01-12 · Source: Microsoft · Feed updated: 2026-09-07

This high severity vulnerability with a CVSS score of 7.7 was published on 2021-01-12 via Microsoft. Affected: Windows Server, version 20H2 (Server Core Installation), Windows 10 Version 1909 for x64-based Systems, Windows Server, version 1909 (Server Core installation) and 2 more.

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