CVE-2021-42284: Windows Hyper-V Denial of Service Vulnerability

Overview

Severity

Medium (CVSS 6.8)

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C

Category

Denial of Service

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2021-Nov

Released

2021-11-09

Last Updated

2022-01-14

EPSS Score

5.82% (percentile: 90.5%)

FAQ

What are the vulnerable configurations of Hyper-V? Any installation of Hyper-V that exposes one or more virtual switches to guests would be vulnerable.

Affected Products (18)

Windows

• Windows 10 Version 1809 for x64-based Systems
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows 10 Version 1909 for x64-based Systems
• Windows 10 Version 21H1 for x64-based Systems
• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows 10 Version 2004 for x64-based Systems
• Windows Server, version 2004 (Server Core installation)
• Windows Server, version 20H2 (Server Core Installation)
• Windows 11 version 21H2 for x64-based Systems
• Windows 10 for x64-based Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows Server 2016
• Windows Server 2016 (Server Core installation)
• Windows 8.1 for x64-based systems

ESU

• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)

Security Updates (9)

• 5007206
• 5007189
• 5007186
• 5007205
• 5007215
• 5007207
• 5007192
• 5007247
• 5007255

Acknowledgments

Maxime Villard, of M.O.R.S.E.

Revision History

• 2021-11-09: Information published.
• 2022-01-14: Updated FAQ information. This is an informational change only.