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

> Attackers can execute arbitrary code on Microsoft 4K Wireless Display Adapters, potentially compromising the device and connected systems.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-9vc3-gg5p-544w

## What is CVE-2021-43899?

CVE-2021-43899 is a critical code injection vulnerability in Microsoft 4K Wireless Display Adapter, published on 15 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Microsoft 4K Wireless Display Adapter Remote Code Execution Vulnerability

## Which versions are affected by CVE-2021-43899?

It affects 1 product.


Products: Microsoft Wireless Display Adapter Firmware.

## How do I fix CVE-2021-43899?

No fix has been published for CVE-2021-43899 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43899 being exploited?

There is no known exploitation of CVE-2021-43899 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft 4K Wireless Display Adapter

- [CVE-2018-8306](https://insights.sbomify.com/CVE-2018-8306/): Command injection in Microsoft Wireless Display Adapter V2 Software (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43899 and fix it if it is affected.

What it is: CVE-2021-43899 is a critical code injection vulnerability in Microsoft 4K Wireless Display Adapter, published on 15 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-43899 in the wild and no public exploit code.

Affected product: Microsoft 4K Wireless Display Adapter. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-43899/ (Markdown: https://insights.sbomify.com/CVE-2021-43899/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43899
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43899
- OSV: https://osv.dev/vulnerability/CVE-2021-43899

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43899/
Summaries are generated and may contain mistakes; the official description above is the record.