CVE-2022-21905: Windows Hyper-V Security Feature Bypass Vulnerability

Overview

Severity
Medium (CVSS 4.6)
CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C
Category
Security Feature Bypass
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2022-Jan
Released
2022-01-11
EPSS Score
0.42% (percentile: 62.0%)

FAQ

What configurations or versions could be at risk from this vulnerability? This bypass could affect any Hyper-V configurations that are using Router Guard. What is the exposure if the vulnerability was bypassed? Certain packets that would normally be blocked or dropped could be processed. This could allow an attacker to bypass set policy, potentially influencing router paths.

Affected Products (22)

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 Server, version 20H2 (Server Core Installation)
  • Windows 11 version 21H2 for x64-based Systems
  • Windows 10 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 7 for x64-based Systems Service Pack 1
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  • Windows Server 2012
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 R2 (Server Core installation)

Security Updates (13)

Acknowledgments

<a href="https://blog.champtar.fr/">Etienne Champetier (@champtar)</a>

Revision History

  • 2022-01-11: Information published.