# CVE-2021-37595: Other in n/a

> Missing input validation in FreeRDP Windows client allows attackers to cause a denial of service via malformed File Contents Request PDUs.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 27 Jul 2021
- **Updated:** 4 Aug 2024

## What is CVE-2021-37595?

CVE-2021-37595 is a critical vulnerability in Freerdp Freerdp, published on 27 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In FreeRDP before 2.4.0 on Windows, wf_cliprdr_server_file_contents_request in client/Windows/wf_cliprdr.c has missing input checks for a FILECONTENTS_RANGE File Contents Request PDU.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-37595?

It affects 1 product.


Products: Freerdp Freerdp.

## How do I fix CVE-2021-37595?

No fix has been published for CVE-2021-37595 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-37595 being exploited?

There is no known exploitation of CVE-2021-37595 in the wild and no public exploit code.

## Other vulnerabilities in Freerdp Freerdp

- [CVE-2021-37594](https://insights.sbomify.com/CVE-2021-37594/): Other in n/a (critical 9.8)
- [CVE-2026-67305](https://insights.sbomify.com/CVE-2026-67305/): FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr (critical 9.4)
- [CVE-2026-66402](https://insights.sbomify.com/CVE-2026-66402/): FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass (critical 9.3)
- [CVE-2026-67289](https://insights.sbomify.com/CVE-2026-67289/): FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection (critical 9.3)
- [CVE-2026-67292](https://insights.sbomify.com/CVE-2026-67292/): FreeRDP before 3.29.0 WebSocket Ping Buffer Over-disclosure (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-37595 and fix it if it is affected.

What it is: CVE-2021-37595 is a critical vulnerability in Freerdp Freerdp, published on 27 Jul 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-2021-37595 in the wild and no public exploit code.

Affected product: Freerdp Freerdp. 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-2021-37595/ (Markdown: https://insights.sbomify.com/CVE-2021-37595/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-37595
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-37595
- OSV: https://osv.dev/vulnerability/CVE-2021-37595

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-37595/
Summaries are generated and may contain mistakes; the official description above is the record.