# CVE-2020-28871: File upload in n/a

> An attacker can upload malicious files to Monitorr to execute arbitrary code on the server without authentication.

- **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:** 10 Feb 2021
- **Updated:** 4 Aug 2024
- **Also known as:** CVE-2024-0713, GHSA-pcjf-xrw4-4cc2

## What is CVE-2020-28871?

CVE-2020-28871 is a critical vulnerability in n/a, published on 10 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Remote code execution in Monitorr v1.7.6m in upload.php allows an unauthorized person to execute arbitrary code on the server-side via an insecure file upload.

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

## Which versions are affected by CVE-2020-28871?

It affects 1 product.


Products: Monitorr Monitorr.

## How do I fix CVE-2020-28871?

No fix has been published for CVE-2020-28871 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-28871 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-28871 exists.

Public exploit code:

- Monitorr unauthenticated Remote Code Execution (RCE) (metasploit)
- Monitorr 1.7.6m - Unauthenticated Remote Code Execution (nuclei): http/cves/2020/CVE-2020-28871.yaml

## Other vulnerabilities in n/a

- [CVE-2020-28872](https://insights.sbomify.com/CVE-2020-28872/): Auth bypass in n/a (critical 9.8)
- [CVE-2023-26775](https://insights.sbomify.com/CVE-2023-26775/): File upload in n/a (high 7.8)
- [CVE-2023-26776](https://insights.sbomify.com/CVE-2023-26776/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2025-7060](https://insights.sbomify.com/CVE-2025-7060/): Monitorr Installer mkdbajax.php input validation (low 2.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-28871 and fix it if it is affected.

What it is: CVE-2020-28871 is a critical vulnerability in n/a, published on 10 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-28871 exists.

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-2020-28871/ (Markdown: https://insights.sbomify.com/CVE-2020-28871/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-28871
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-28871
- OSV: https://osv.dev/vulnerability/CVE-2020-28871

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-28871/
Summaries are generated and may contain mistakes; the official description above is the record.