CVE-2021-34450: Windows Hyper-V Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.5)

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2021-Jul

Released

2021-07-13

EPSS Score

1.69% (percentile: 82.3%)

FAQ

How would an attacker exploit this vulnerability? This vulnerability would require an authenticated attacker on a guest VM to send specially crafted file operation requests on the VM to hardware resources on the VM which could result in remote code execution on the host server.

Affected Products (9)

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

Security Updates (3)

• 5004244
• 5004245
• 5004237

Acknowledgments

Microsoft Platform Security Assurance & Vulnerability Research

Revision History

• 2021-07-13: Information published.