# CVE-2021-20094: Denial of service in Wibu-Systems CodeMeter

> An unauthenticated remote attacker can crash the CodeMeter Runtime Server, causing a denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 16 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-fm8v-xp26-8h3q

## What is CVE-2021-20094?

CVE-2021-20094 is a high-severity denial of service vulnerability in Wibu-Systems CodeMeter, published on 16 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A denial of service vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An unauthenticated remote attacker can exploit this issue to crash the CodeMeter Runtime Server.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-20094?

It affects 3 products.


Products: Siemens Pss Cape, Siemens Sicam 230 Firmware, Wibu Codemeter.

## How do I fix CVE-2021-20094?

No fix has been published for CVE-2021-20094 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20094 being exploited?

There is no known exploitation of CVE-2021-20094 in the wild and no public exploit code.

## Other vulnerabilities in Wibu-Systems CodeMeter

- [CVE-2021-20093](https://insights.sbomify.com/CVE-2021-20093/): Information disclosure in Wibu-Systems CodeMeter (critical 9.1)
- [CVE-2021-41057](https://insights.sbomify.com/CVE-2021-41057/): Path traversal in n/a (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20094 and fix it if it is affected.

What it is: CVE-2021-20094 is a high-severity denial of service vulnerability in Wibu-Systems CodeMeter, published on 16 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-20094 in the wild and no public exploit code.

Affected product: Wibu-Systems CodeMeter. 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-2021-20094/ (Markdown: https://insights.sbomify.com/CVE-2021-20094/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20094
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20094
- OSV: https://osv.dev/vulnerability/CVE-2021-20094

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20094/
Summaries are generated and may contain mistakes; the official description above is the record.