Read the docs
TI-2021-16246 Aliases CVE-2021-38672GHSA-c3x4-42jc-832x

Windows Hyper-V Remote Code Execution Vulnerability

Priority MEDIUM 43Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

Windows Hyper-V Remote Code Execution Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0109 65th percentileScored 2026-11-07
Fix Fixed Windows Server 2022 (Microsoft): 10.0.20348.288Windows 11 version 21H2 (Microsoft): 10.0.22000.258

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftWindows Server 202210.0.0 to before 10.0.20348.28810.0.20348.288Patch availableCNA
MicrosoftWindows 11 version 21H210.0.0 to before 10.0.22000.25810.0.22000.258Patch availableCNA
  • Windows Server 2022 VendorMicrosoft Affected 10.0.0 to before 10.0.20348.288 Fixed in 10.0.20348.288 Patch available CNA
  • Windows 11 version 21H2 VendorMicrosoft Affected 10.0.0 to before 10.0.22000.258 Fixed in 10.0.22000.258 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:x64:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*all versionsVulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:x64:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Microsoft

Remediation

  • Fix · CNA Windows Server 2022 (Microsoft) Fixed in 10.0.20348.288
  • Fix · CNA Windows 11 version 21H2 (Microsoft) Fixed in 10.0.22000.258

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-38672
  2. 2026-10-03 Alias added: GHSA-c3x4-42jc-832x

References

Patch 1

  • TI-2021-17499 Win32k Elevation of Privilege Vulnerability KEVCVSS 3.1HIGH 7.8
  • TI-2022-10056 Remote Procedure Call Runtime Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2022-06273 HTTP Protocol Stack Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2022-15533 Windows Internet Key Exchange (IKE) Protocol Extensions Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2023-08140 Windows Internet Key Exchange (IKE) Extension Denial of Service Vulnerability CVSS 3.1HIGH 7.5
  • TI-2022-12476 Windows Server Service Tampering Vulnerability CVSS 3.1HIGH 8.8
See all 572 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences