# CVE-2021-36100: Authenticated remote code execution

> Authenticated attackers can execute arbitrary system commands via crafted strings in OTRS system configuration.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:R/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:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 21 Mar 2022
- **Updated:** 17 Sep 2024
- **Also known as:** DEBIAN-CVE-2021-36100, GHSA-9jrh-x229-v96c, UBUNTU-CVE-2021-36100

## What is CVE-2021-36100?

CVE-2021-36100 is a medium-severity command injection vulnerability in Otrs Otrs, published on 21 Mar 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Specially crafted string in OTRS system configuration can allow the execution of any system command.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2021-36100?

It affects 3 products.


Products: Otrs Otrs, Otrs Otrs Itsm, Otrs Otrs Storm.

## How do I fix CVE-2021-36100?

Apply the vendor's patch.

## Is CVE-2021-36100 being exploited?

There is no known exploitation of CVE-2021-36100 in the wild and no public exploit code.

## Other vulnerabilities in Otrs Otrs

- [CVE-2026-48188](https://insights.sbomify.com/CVE-2026-48188/): SQL Injection via MySQL Quote Method (critical 9.1)
- [CVE-2013-4717](https://insights.sbomify.com/CVE-2013-4717/): SQL injection in n/a (high 8.8)
- [CVE-2017-14635](https://insights.sbomify.com/CVE-2017-14635/): Code injection in n/a (high 8.8)
- [CVE-2023-5422](https://insights.sbomify.com/CVE-2023-5422/): SSL Certificates are not checked for E-Mail Handling (high 8.7)
- [CVE-2023-6254](https://insights.sbomify.com/CVE-2023-6254/): Password is send back to client (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-36100 and fix it if it is affected.

What it is: CVE-2021-36100 is a medium-severity command injection vulnerability in Otrs Otrs, published on 21 Mar 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-36100 in the wild and no public exploit code.

Affected product: Otrs Otrs. 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-2021-36100/ (Markdown: https://insights.sbomify.com/CVE-2021-36100/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-36100
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-36100
- OSV: https://osv.dev/vulnerability/CVE-2021-36100

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-36100/
Summaries are generated and may contain mistakes; the official description above is the record.