# CVE-2021-36573: FeehiCMS Unrestricted Upload vulnerability

> Attackers can execute arbitrary code by uploading crafted images in Feehi CMS, requiring immediate upgrade to secure the web application.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Dec 2022
- **Updated:** 21 Apr 2025
- **Also known as:** GHSA-67mh-hw8v-x8v9

## What is CVE-2021-36573?

CVE-2021-36573 is a medium-severity vulnerability in n/a, published on 15 Dec 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

File Upload vulnerability in Feehi CMS thru 2.1.1 allows attackers to run arbitrary code via crafted image upload.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-36573?

2 open source packages ship an affected version, including feehi/feehicms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `feehi/feehicms` | Packagist | All versions to 2.1.1 | None |
| `feehi/feehicms` | Packagist | All versions to 2.1.1 | None |

Products: Feehi Feehicms.

## How do I fix CVE-2021-36573?

No fix has been published for CVE-2021-36573 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-36573 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-36573 exists.

## Other vulnerabilities in n/a

- [CVE-2020-21174](https://insights.sbomify.com/CVE-2020-21174/): liufee CMS File Upload vulnerability (critical 9.8)
- [CVE-2020-21489](https://insights.sbomify.com/CVE-2020-21489/): Liufee CMS File Upload vulnerability (critical 9.8)
- [CVE-2020-21516](https://insights.sbomify.com/CVE-2020-21516/): FeehiCMS has an arbitrary file upload vulnerability (critical 9.8)
- [CVE-2020-21322](https://insights.sbomify.com/CVE-2020-21322/): Arbitrary Code Execution in feehi/cms (critical 9.8)
- [CVE-2025-15264](https://insights.sbomify.com/CVE-2025-15264/): FeehiCMS TimThumb timthumb.php server-side request forgery (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-36573 and fix it if it is affected.

What it is: CVE-2021-36573 is a medium-severity vulnerability in n/a, published on 15 Dec 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-36573 exists.

Affected packages and fixed versions:
- feehi/feehicms (Packagist): affected all versions up to 2.1.1; no fix listed
- feehi/feehicms (Packagist): affected all versions up to 2.1.1; no fix listed

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-2021-36573/ (Markdown: https://insights.sbomify.com/CVE-2021-36573/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-36573
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-36573
- OSV: https://osv.dev/vulnerability/CVE-2021-36573

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-36573/
Summaries are generated and may contain mistakes; the official description above is the record.