Search/CVE-2021-26443
● CVE — Critical

CVE-2021-26443

VendormicrosoftProductwindows server 2016, windows server 2019, windows server 2022, windows 10, windows 11DiscoveredNov 10, 2021UpdatedAug 19, 2026

Microsoft Virtual Machine Bus (VMBus) Remote Code Execution Vulnerability

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CVSS v3.1
9 CRITICAL
EPSS
1.70%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 16, 2026 → Oct 22, 2026
▲ 0.16pp
1.54% → 1.70% over 4 tracked changes
CVSS v3.1 Detail
Attack VectorADJACENT
Attack ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
ScopeCHANGED
ConfidentialityHIGH
IntegrityHIGH
AvailabilityHIGH
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Connections
5 relationships
Timeline
disclosure → media coverage
Nov 10, 2021
Disclosure — published as a CVE record. · last revised by NVD Aug 19, 2026