# CVE-2019-16199: Auth bypass in n/a

> Unauthenticated attackers can execute arbitrary code on HomeMatic CCU2 and CCU3 devices via the web interface.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 17 Sep 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-mhvr-v5c8-rw24

## What is CVE-2019-16199?

CVE-2019-16199 is a critical authentication bypass vulnerability in n/a, published on 17 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

eQ-3 Homematic CCU2 before 2.47.18 and CCU3 before 3.47.18 allow Remote Code Execution by unauthenticated attackers with access to the web interface via an HTTP POST request to certain URLs related to the ReGa core process.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2019-16199?

It affects 2 products.


Products: Eq-3 Homematic Ccu2 Firmware, Eq-3 Homematic Ccu3 Firmware.

## How do I fix CVE-2019-16199?

No fix has been published for CVE-2019-16199 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-16199 being exploited?

There is no known exploitation of CVE-2019-16199 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-33032](https://insights.sbomify.com/CVE-2021-33032/): Command injection in n/a (critical 10.0)
- [CVE-2019-18937](https://insights.sbomify.com/CVE-2019-18937/): Command injection in n/a (critical 9.8)
- [CVE-2019-18938](https://insights.sbomify.com/CVE-2019-18938/): Code injection in n/a (critical 9.8)
- [CVE-2019-18939](https://insights.sbomify.com/CVE-2019-18939/): Command injection in n/a (critical 9.8)
- [CVE-2019-9584](https://insights.sbomify.com/CVE-2019-9584/): Missing authorization in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-16199 and fix it if it is affected.

What it is: CVE-2019-16199 is a critical authentication bypass vulnerability in n/a, published on 17 Sep 2019. 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-2019-16199 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-2019-16199/ (Markdown: https://insights.sbomify.com/CVE-2019-16199/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-16199
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-16199
- OSV: https://osv.dev/vulnerability/CVE-2019-16199

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-16199/
Summaries are generated and may contain mistakes; the official description above is the record.