# CVE-2020-21516: FeehiCMS has an arbitrary file upload vulnerability

> Attackers can upload malicious PHP files via the head image upload feature in FeehiCMS to execute arbitrary code on the server.

- **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:** Yes
- **Published:** 6 Sep 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-jj62-mc3m-j769

## What is CVE-2020-21516?

CVE-2020-21516 is a critical vulnerability in n/a, published on 6 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

There is an arbitrary file upload vulnerability in FeehiCMS 2.0.8 at the head image upload, that allows attackers to execute relevant PHP code.

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

## Which versions are affected by CVE-2020-21516?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `feehi/cms` | Packagist | All versions | 2.0.8.1 |
| `feehi/cms` | Packagist | All versions | 2.0.8.1 |

Products: Feehi Feehicms.

## How do I fix CVE-2020-21516?

Upgrade feehi/cms to 2.0.8.1 or later.

## Is CVE-2020-21516 being exploited?

There is no known exploitation of CVE-2020-21516 in the wild and no public exploit code.

## 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-2020-21322](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)
- [CVE-2025-65657](https://insights.sbomify.com/CVE-2025-65657/): FeehiCMS Has a Remote Code Execution via Unrestricted File Upload in Ad Management (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-21516 and fix it if it is affected.

What it is: CVE-2020-21516 is a critical vulnerability in n/a, published on 6 Sep 2022. 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-2020-21516 in the wild and no public exploit code.

Affected packages and fixed versions:
- feehi/cms (Packagist): affected all versions; fixed in 2.0.8.1
- feehi/cms (Packagist): affected all versions; fixed in 2.0.8.1

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-2020-21516/ (Markdown: https://insights.sbomify.com/CVE-2020-21516/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-21516
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-21516
- OSV: https://osv.dev/vulnerability/CVE-2020-21516

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-21516/
Summaries are generated and may contain mistakes; the official description above is the record.