# CVE-2021-34574: Password policy evasion in products of MB connect line and Helmholz

> Authenticated attackers can bypass password policy restrictions by intercepting and modifying password change requests in MB connect line and Helmholz products.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`)
- **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 Aug 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-c4j8-5xv4-xcxh

## What is CVE-2021-34574?

CVE-2021-34574 is a medium-severity vulnerability in Helmholz mbCONNECT24, published on 2 Aug 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In MB connect line mymbCONNECT24, mbCONNECT24 and Helmholz myREX24 and myREX24.virtual in all versions through v2.11.2 an authenticated attacker can change the password of his account into a new password that violates the password policy by intercepting and modifying the request that is send to the server.

Weakness: CWE-669 (Incorrect Resource Transfer Between Spheres)

## Which versions are affected by CVE-2021-34574?

It affects 4 products.


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

## How do I fix CVE-2021-34574?

No fix has been published for CVE-2021-34574 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-34574 being exploited?

There is no known exploitation of CVE-2021-34574 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-2020-12527](https://insights.sbomify.com/CVE-2020-12527/): Improper Access Validation in products of MB connect line and Helmholz (medium 6.5)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-34574 and fix it if it is affected.

What it is: CVE-2021-34574 is a medium-severity vulnerability in Helmholz mbCONNECT24, published on 2 Aug 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-2021-34574 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-2021-34574/ (Markdown: https://insights.sbomify.com/CVE-2021-34574/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-34574
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-34574
- OSV: https://osv.dev/vulnerability/CVE-2021-34574

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-34574/
Summaries are generated and may contain mistakes; the official description above is the record.