What is CVE-2021-26867?

CVE-2021-26867 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Windows Hyper-V Remote Code Execution Vulnerability

Which CVE IDs does CVE-2021-26867 cover?

CVE-2021-26867 covers the following CVE IDs: CVE-2021-26867. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2021-26867?

CVE-2021-26867 has a CVSS v3 base score of 9.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2021-26867?

CVE-2021-26867 affects 5 products, including: Windows 10 Version 1909 for x64-based Systems; Windows 10 Version 2004 for x64-based Systems; Windows Server, version 1909 (Server Core installation); Windows Server, version 2004 (Server Core installation); Windows Server, version 20H2 (Server Core Installation).

CVE-2021-26867CriticalCVSS 9.9

Windows Hyper-V Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

March 9, 2021

Last Modified

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🔗 CVE IDs covered (1)

CVE-2021-26867 →

📋 Description

Which Hyper-V systems are vulnerable? Any Hyper-V client which is configured to use the Plan 9 file system could be vulnerable. An authenticated attacker who successfully exploited this vulnerability on a Hyper-V client could cause code to execute on the Hyper-V server.

🎯 Affected products5

Windows 10 Version 1909 for x64-based Systems
Windows 10 Version 2004 for x64-based Systems
Windows Server, version 1909 (Server Core installation)
Windows Server, version 2004 (Server Core installation)
Windows Server, version 20H2 (Server Core Installation)

✅ Remediation

KB5000808 (Security Update) — fixed build 10.0.18363.1440 KB5000802 (Security Update) — fixed build 10.0.19043.867

🔗 References (5)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26867
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5000808
referencehttps://support.microsoft.com/help/5000808
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5000802
referencehttps://support.microsoft.com/help/5000802