# CVE-2020-12527: Improper Access Validation in products of MB connect line and Helmholz

> Logged-in users can shut down or reboot devices without proper permissions, causing denial of service in MB connect line and Helmholz products.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Mar 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-vv92-932q-3jmg

## What is CVE-2020-12527?

CVE-2020-12527 is a medium-severity missing authorization vulnerability in Helmholz mbCONNECT24, published on 2 Mar 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An issue was discovered in MB connect line mymbCONNECT24, mbCONNECT24 and Helmholz myREX24 and myREX24.virtual in all versions through v2.11.2. Improper access validation allows a logged in user to shutdown or reboot devices in his account without having corresponding permissions.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2020-12527?

It affects 4 products.


Products: Helmholz Myrex24, Helmholz Myrex24.virtual, Mbconnectline Mbconnect24, Mbconnectline Mymbconnect24.

## How do I fix CVE-2020-12527?

No fix has been published for CVE-2020-12527 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-12527 being exploited?

There is no known exploitation of CVE-2020-12527 in the wild and no public exploit code.

## Other vulnerabilities in Helmholz mbCONNECT24

- [CVE-2020-35558](https://insights.sbomify.com/CVE-2020-35558/): SSRF in products of MB connect line and Helmholz (high 7.5)
- [CVE-2020-35557](https://insights.sbomify.com/CVE-2020-35557/): Improper Access Validation in products of MB connect line and Helmholz (medium 6.5)
- [CVE-2022-22520](https://insights.sbomify.com/CVE-2022-22520/): User enumeration vulnerability in MB connect line and Helmholz products (medium 5.3)
- [CVE-2020-35561](https://insights.sbomify.com/CVE-2020-35561/): SSRF in variuos products of MB connect line and Helmholz (medium 5.3)
- [CVE-2020-35566](https://insights.sbomify.com/CVE-2020-35566/): Local file inclusion vulnerability in products of MB connect line and Helmholz (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-12527 and fix it if it is affected.

What it is: CVE-2020-12527 is a medium-severity missing authorization vulnerability in Helmholz mbCONNECT24, published on 2 Mar 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-12527 in the wild and no public exploit code.

Affected product: Helmholz mbCONNECT24. 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-2020-12527/ (Markdown: https://insights.sbomify.com/CVE-2020-12527/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-12527
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-12527
- OSV: https://osv.dev/vulnerability/CVE-2020-12527

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-12527/
Summaries are generated and may contain mistakes; the official description above is the record.