How severe is CVE-2021-43899?

CVE-2021-43899 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-43899 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43899?

CVE-2021-43899 affects Microsoft Wireless Display Adapter Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43899?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-43899 published?

CVE-2021-43899 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-43899

CVE-2021-43899 is a critical-severity vulnerability in Microsoft Wireless Display Adapter Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Wireless Display Adapter Firmware
Published: 2021-12-15
Last modified: 2026-06-17

Description

Microsoft 4K Wireless Display Adapter Remote Code Execution Vulnerability

Frequently asked questions

What is CVE-2021-43899?: Microsoft 4K Wireless Display Adapter Remote Code Execution Vulnerability
How severe is CVE-2021-43899?: CVE-2021-43899 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-43899 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43899?: CVE-2021-43899 affects Microsoft Wireless Display Adapter Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43899?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-43899 published?: CVE-2021-43899 was published on 2021-12-15 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:o:microsoft:wireless_display_adapter_firmware:*:*:*:*:*:*:*:*

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