What’s Vulnerable › Vulnerabilities

CVE-2021-38672: Windows Hyper-V Remote Code Execution Vulnerability

• Severity: medium (CVSS 5.2 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-13 · updated 2026-06-17

Description

Windows Hyper-V Remote Code Execution Vulnerability

Affected products

• Microsoft Windows 11 version 21H2: all versions
• Microsoft Windows Server 2022: all versions
• Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.258 — fixed in 10.0.22000.258
• Microsoft Windows Server 2022: from 10.0.0 before 10.0.20348.288 — fixed in 10.0.20348.288

How to fix

Upgrade to a fixed version: Microsoft Windows 11 21H2 10.0.22000.258; Microsoft Windows Server 2022 10.0.20348.288. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38672
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38672

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