CVE-2021-43899: Microsoft 4K Wireless Display Adapter Remote Code Execution Vulnerability

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-12-15 · updated 2026-06-17

Description

Microsoft 4K Wireless Display Adapter Remote Code Execution Vulnerability

Affected products

Microsoft 4K Wireless Display Adapter: before 3.9520.47 — fixed in 3.9520.47
Microsoft 4K Wireless Display Adapter: from 3.0.0 before 3.9520.47 — fixed in 3.9520.47

How to fix

Upgrade to a fixed version: Microsoft 4K Wireless Display Adapter 3.9520.47; Microsoft 4K Wireless Display Adapter 3.9520.47. Check the vendor advisory for mitigations.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43899
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43899

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