Summary
Impact: Remote Code Execution. Microsoft rating: Critical. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
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.
Security updates
10.0.18363.1440 — https://support.microsoft.com/help/5000808
10.0.19043.867 — https://support.microsoft.com/help/5000802
Vulnerabilities 1
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Critical 9.9
Windows Hyper-V Remote Code Execution Vulnerability
Windows Hyper-V Remote Code Execution Vulnerability
Revision history
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#1
Information published.
References
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CVE-2021-26867 Windows Hyper-V Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26867
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss