# CVE-2021-30187: Command injection in n/a

> Attackers can execute arbitrary OS commands on CODESYS V2 runtime systems, posing a critical risk to industrial control environments.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:L/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-mrvh-5hf5-fwp3

## What is CVE-2021-30187?

CVE-2021-30187 is a medium-severity command injection vulnerability in n/a, published on 25 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

CODESYS V2 runtime system SP before 2.4.7.55 has Improper Neutralization of Special Elements used in an OS Command.

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

## Which versions are affected by CVE-2021-30187?

It affects 28 products.


Products: Codesys Runtime Toolkit, Wago 750-8202 Firmware, Wago 750-8203 Firmware, Wago 750-8204 Firmware, Wago 750-8206 Firmware, Wago 750-8207 Firmware, Wago 750-8208 Firmware, Wago 750-8210 Firmware, Wago 750-8211 Firmware, Wago 750-8212 Firmware, Wago 750-8213 Firmware, Wago 750-8214 Firmware, Wago 750-8216 Firmware, Wago 750-8217 Firmware, Wago 750-823 Firmware, Wago 750-829 Firmware, Wago 750-831 Firmware, Wago 750-832 Firmware, Wago 750-852 Firmware, Wago 750-862 Firmware and 8 more.

## How do I fix CVE-2021-30187?

No fix has been published for CVE-2021-30187 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-30187 being exploited?

There is no known exploitation of CVE-2021-30187 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-33486](https://insights.sbomify.com/CVE-2021-33486/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-30187 and fix it if it is affected.

What it is: CVE-2021-30187 is a medium-severity command injection vulnerability in n/a, published on 25 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-30187 in the wild and no public exploit code.

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-2021-30187/ (Markdown: https://insights.sbomify.com/CVE-2021-30187/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-30187
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-30187
- OSV: https://osv.dev/vulnerability/CVE-2021-30187

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-30187/
Summaries are generated and may contain mistakes; the official description above is the record.