VulnerabilityModified

CVE-2021-26443

Microsoft Virtual Machine Bus (VMBus) Remote Code Execution Vulnerability

CRITICAL 9.0EPSS 1.68%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.68%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

Microsoft Virtual Machine Bus (VMBus) Remote Code Execution Vulnerability

CVSS 3.1: 9.0 CRITICALCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS: 1.68% probability · 76th percentile
CISA KEV: Not listed
Affected: microsoft/windows 10 · microsoft/windows 11 · microsoft/windows server 2016 · microsoft/windows server 2019 · microsoft/windows server 2022
Source: secure@microsoft.com

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26443
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26443Patch, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.