# CVE-2021-4304: eprintsug ulcc-core toolbox command injection

> Remote attackers can execute arbitrary commands via the password argument in the toolbox component of EPrints.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Jan 2023
- **Updated:** 28 May 2025
- **Also known as:** GHSA-4qqx-g5v3-6fmx

## What is CVE-2021-4304?

CVE-2021-4304 is a medium-severity command injection vulnerability in eprintsug ulcc-core, published on 5 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in eprintsug ulcc-core. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file cgi/toolbox/toolbox. The manipulation of the argument password leads to command injection. The attack can be launched remotely. The patch is named 811edaae81eb044891594f00062a828f51b22cb1. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-217447.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2021-4304?

It affects 1 product.


Products: Ulcc-Core Project Ulcc-Core.

## How do I fix CVE-2021-4304?

No fix has been published for CVE-2021-4304 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-4304 being exploited?

There is no known exploitation of CVE-2021-4304 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-4304 and fix it if it is affected.

What it is: CVE-2021-4304 is a medium-severity command injection vulnerability in eprintsug ulcc-core, published on 5 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-4304 in the wild and no public exploit code.

Affected product: eprintsug ulcc-core. 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-2021-4304/ (Markdown: https://insights.sbomify.com/CVE-2021-4304/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-4304
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-4304
- OSV: https://osv.dev/vulnerability/CVE-2021-4304

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-4304/
Summaries are generated and may contain mistakes; the official description above is the record.