# CVE-2021-33224: File upload in n/a

> Unauthenticated attackers can execute arbitrary code by uploading malicious web.config and asp files in Umbraco Forms.

- **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:** 24 Feb 2023
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-74cc-qrjm-qwjc

## What is CVE-2021-33224?

CVE-2021-33224 is a critical vulnerability in n/a, published on 24 Feb 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

File upload vulnerability in Umbraco Forms v.8.7.0 allows unauthenticated attackers to execute arbitrary code via a crafted web.config and asp file.

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

## Which versions are affected by CVE-2021-33224?

It affects 1 product.


Products: Umbraco Umbraco Forms.

## How do I fix CVE-2021-33224?

No fix has been published for CVE-2021-33224 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33224 being exploited?

There is no known exploitation of CVE-2021-33224 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-68924](https://insights.sbomify.com/CVE-2025-68924/): UmbracoForms Vulnerable to Remote Code Execution via Untrusted WSDL Compilation in Dynamic SOAP Client Generation (high 7.5)
- [CVE-2026-24687](https://insights.sbomify.com/CVE-2026-24687/): Umbraco.Forms has path traversal and file enumeration vulnerability in Linux/Mac (medium 6.0)
- [CVE-2025-23041](https://insights.sbomify.com/CVE-2025-23041/): Short and Long Answer Fields Are Not Validated Server-Side For Maximum Length in Umbraco.Forms (medium 5.8)
- [CVE-2020-7685](https://insights.sbomify.com/CVE-2020-7685/): Insecure Defaults (medium 5.4)
- [CVE-2024-35239](https://insights.sbomify.com/CVE-2024-35239/): Stored Cross-site Scripting on Components of Umbraco Forms (low 2.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33224 and fix it if it is affected.

What it is: CVE-2021-33224 is a critical vulnerability in n/a, published on 24 Feb 2023. 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-2021-33224 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-2021-33224/ (Markdown: https://insights.sbomify.com/CVE-2021-33224/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33224
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33224
- OSV: https://osv.dev/vulnerability/CVE-2021-33224

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33224/
Summaries are generated and may contain mistakes; the official description above is the record.