# CVE-2021-44426: File upload in n/a

> An attacker can upload arbitrary files to a victim's Downloads folder without approval when both connect to the same remote machine via AnyDesk.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 Sep 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-2r63-v4pm-8j7g

## What is CVE-2021-44426?

CVE-2021-44426 is a high-severity vulnerability in n/a, published on 12 Sep 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

An issue was discovered in AnyDesk before 6.2.6 and 6.3.x before 6.3.5. An upload of an arbitrary file to a victim's local ~/Downloads/ directory is possible if the victim is using the AnyDesk Windows client to connect to a remote machine, if an attacker is also connected remotely with AnyDesk to the same remote machine. The upload is done without any approval or action taken by the victim.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2021-44426?

It affects 1 product.


Products: Anydesk Anydesk.

## How do I fix CVE-2021-44426?

No fix has been published for CVE-2021-44426 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-44426 being exploited?

There is no known exploitation of CVE-2021-44426 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-27918](https://insights.sbomify.com/CVE-2025-27918/): Integer overflow in n/a (critical 9.8)
- [CVE-2020-13160](https://insights.sbomify.com/CVE-2020-13160/): Other in n/a (critical 9.8)
- [CVE-2017-14397](https://insights.sbomify.com/CVE-2017-14397/): AnyDesk before 3.6.1 on Windows has a DLL injection vulnerability. (critical 9.8)
- [CVE-2016-20094](https://insights.sbomify.com/CVE-2016-20094/): AnyDesk 2.5.0 Unquoted Service Path Elevation of Privilege (high 8.5)
- [CVE-2019-25261](https://insights.sbomify.com/CVE-2019-25261/): AnyDesk 5.4.0 - Unquoted Service Path (high 8.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-44426 and fix it if it is affected.

What it is: CVE-2021-44426 is a high-severity vulnerability in n/a, published on 12 Sep 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-44426 in the wild and no public exploit code.

Affected product: n/a. 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-2021-44426/ (Markdown: https://insights.sbomify.com/CVE-2021-44426/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-44426
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-44426
- OSV: https://osv.dev/vulnerability/CVE-2021-44426

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-44426/
Summaries are generated and may contain mistakes; the official description above is the record.