Vulnerability in Microsoft Windows_10

CVE-2021-26867

Windows Hyper-V Remote Code Execution Vulnerability

EPSS: 0.026 (83.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Microsoft Windows_10 — versions 20h2, 1909, 2004
Microsoft Windows 10 Version 1909 — versions 10.0.0
Microsoft Windows 10 Version 2004 — versions 10.0.0
Microsoft Windows_server_2016 — versions 20h2, 1909, 2004
Microsoft Windows Server, Version 1909 (Server Core Installation) — versions 10.0.0
Microsoft Windows Server Version 2004 — versions 10.0.0
Microsoft Windows Server Version 20h2 — versions 10.0.0

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

secure@microsoft.com (Patch, x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26867?: CVE-2021-26867 is a critical-severity vulnerability in Microsoft Windows_10. CVSS score: 9.9/10. Published 2021-03-11.
How severe is CVE-2021-26867?: Critical severity. CVSS v3 base score is 9.9 out of 10.
Is CVE-2021-26867 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.