# CVE-2019-18246: Auth bypass in BIOTRONIK CardioMessenger II-S T-Line, CardioMessenger II-S GSM

> Attackers can bypass mutual authentication with the remote communication infrastructure of BIOTRONIK CardioMessenger II devices.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Jun 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-r2p2-ghmw-h7xw

## What is CVE-2019-18246?

CVE-2019-18246 is a medium-severity authentication bypass vulnerability in BIOTRONIK CardioMessenger II-S T-Line, CardioMessenger II-S GSM, published on 29 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

BIOTRONIK CardioMessenger II, The affected products do not properly enforce mutual authentication with the BIOTRONIK Remote Communication infrastructure.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2019-18246?

It affects 2 products.


Products: Biotronik Cardiomessenger Ii-S Gsm Firmware, Biotronik Cardiomessenger Ii-S T-Line Firmware.

## How do I fix CVE-2019-18246?

No fix has been published for CVE-2019-18246 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-18246 being exploited?

There is no known exploitation of CVE-2019-18246 in the wild and no public exploit code.

## Other vulnerabilities in BIOTRONIK CardioMessenger II-S T-Line, CardioMessenger II-S GSM

- [CVE-2019-18254](https://insights.sbomify.com/CVE-2019-18254/): Information disclosure in BIOTRONIK CardioMessenger II-S T-Line, CardioMessenger II-S GSM (medium 4.6)
- [CVE-2019-18256](https://insights.sbomify.com/CVE-2019-18256/): Hardcoded credentials in BIOTRONIK CardioMessenger II-S T-Line, CardioMessenger II-S GSM (medium 4.6)
- [CVE-2019-18248](https://insights.sbomify.com/CVE-2019-18248/): Information disclosure in BIOTRONIK CardioMessenger II-S T-Line, CardioMessenger II-S GSM (medium 4.3)
- [CVE-2019-18252](https://insights.sbomify.com/CVE-2019-18252/): Information disclosure in BIOTRONIK CardioMessenger II-S T-Line, CardioMessenger II-S GSM (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-18246 and fix it if it is affected.

What it is: CVE-2019-18246 is a medium-severity authentication bypass vulnerability in BIOTRONIK CardioMessenger II-S T-Line, CardioMessenger II-S GSM, published on 29 Jun 2020. 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-2019-18246 in the wild and no public exploit code.

Affected product: BIOTRONIK CardioMessenger II-S T-Line, CardioMessenger II-S GSM. 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-2019-18246/ (Markdown: https://insights.sbomify.com/CVE-2019-18246/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-18246
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-18246
- OSV: https://osv.dev/vulnerability/CVE-2019-18246

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-18246/
Summaries are generated and may contain mistakes; the official description above is the record.