# CVE-2019-7594: Metasys use of hardcoded RC2 key

> Attackers can exploit a hardcoded RC2 key in Metasys servers to bypass encryption and access sensitive Site Management Portal data.

- **Severity:** Medium 6.8 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 20 Aug 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-vhqp-g9vm-gc6g

## What is CVE-2019-7594?

CVE-2019-7594 is a medium-severity vulnerability in Johnson Controls Metasys versions prior to 9.0, published on 20 Aug 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Metasys® ADS/ADX servers and NAE/NIE/NCE engines prior to 9.0 make use of a hardcoded RC2 key for certain encryption operations involving the Site Management Portal (SMP).

Weakness: CWE-798 (Use of Hard-coded Credentials), CWE-321 (Use of Hard-coded Cryptographic Key)

## Which versions are affected by CVE-2019-7594?

It affects 1 product.


Products: Johnsoncontrols Metasys System.

## How do I fix CVE-2019-7594?

No fix has been published for CVE-2019-7594 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-7594 being exploited?

There is no known exploitation of CVE-2019-7594 in the wild and no public exploit code.

## Other vulnerabilities in Johnson Controls Metasys versions prior to 9.0

- [CVE-2019-7593](https://insights.sbomify.com/CVE-2019-7593/): Metasys use of shared RSA key pairs (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-7594 and fix it if it is affected.

What it is: CVE-2019-7594 is a medium-severity vulnerability in Johnson Controls Metasys versions prior to 9.0, published on 20 Aug 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-7594 in the wild and no public exploit code.

Affected product: Johnson Controls Metasys versions prior to 9.0. 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-2019-7594/ (Markdown: https://insights.sbomify.com/CVE-2019-7594/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-7594
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-7594
- OSV: https://osv.dev/vulnerability/CVE-2019-7594

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-7594/
Summaries are generated and may contain mistakes; the official description above is the record.