# CVE-2020-21654: File upload in n/a

> Attackers can achieve remote code execution on emlog by uploading a maliciously crafted Zip file via the admin template component.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Oct 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-56cc-h6cm-q73v

## What is CVE-2020-21654?

CVE-2020-21654 is a high-severity vulnerability in Emlog Emlog, published on 6 Oct 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

emlog v6.0 contains a vulnerability in the component admin\template.php, which allows attackers to getshell via a crafted Zip file.

## Which versions are affected by CVE-2020-21654?

It affects 1 product.


Products: Emlog Emlog.

## How do I fix CVE-2020-21654?

No fix has been published for CVE-2020-21654 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-21654 being exploited?

There is no known exploitation of CVE-2020-21654 in the wild and no public exploit code.

## Other vulnerabilities in Emlog Emlog

- [CVE-2025-29401](https://insights.sbomify.com/CVE-2025-29401/): File upload in n/a (critical 9.8)
- [CVE-2025-25783](https://insights.sbomify.com/CVE-2025-25783/): File upload in n/a (critical 9.8)
- [CVE-2023-44973](https://insights.sbomify.com/CVE-2023-44973/): File upload in n/a (critical 9.8)
- [CVE-2023-44974](https://insights.sbomify.com/CVE-2023-44974/): File upload in n/a (critical 9.8)
- [CVE-2023-43291](https://insights.sbomify.com/CVE-2023-43291/): Deserialization in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-21654 and fix it if it is affected.

What it is: CVE-2020-21654 is a high-severity vulnerability in Emlog Emlog, published on 6 Oct 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-21654 in the wild and no public exploit code.

Affected product: Emlog Emlog. 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-2020-21654/ (Markdown: https://insights.sbomify.com/CVE-2020-21654/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-21654
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-21654
- OSV: https://osv.dev/vulnerability/CVE-2020-21654

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-21654/
Summaries are generated and may contain mistakes; the official description above is the record.