# CVE-2025-41679: Unauthenticated Buffer Overflow in Conftool Service Leading to Denial of Service

> Unauthenticated remote attackers can cause a denial of service in the Conftool service via a buffer overflow in Helmholz and MB connect line devices.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Jul 2025
- **Updated:** 3 Nov 2025
- **Also known as:** GHSA-9c9x-54g4-9pfx

## What is CVE-2025-41679?

CVE-2025-41679 is a medium-severity memory corruption vulnerability in Helmholz REX 100, published on 21 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An unauthenticated remote attacker could exploit a buffer overflow vulnerability in the device causing a denial of service that affects only the network initializing wizard (Conftool) service.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2025-41679?

It affects 1 product.


Products: Mbconnectline Mbnet.mini Firmware.

## How do I fix CVE-2025-41679?

No fix has been published for CVE-2025-41679 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-41679 being exploited?

There is no known exploitation of CVE-2025-41679 in the wild and no public exploit code.

## Other vulnerabilities in Helmholz REX 100

- [CVE-2025-41673](https://insights.sbomify.com/CVE-2025-41673/): Remote Command Injection in send_sms Action Due to Improper Input Neutralization (high 7.2)
- [CVE-2025-41674](https://insights.sbomify.com/CVE-2025-41674/): Remote Command Injection in diagnostic Action Due to Improper Input Neutralization (high 7.2)
- [CVE-2025-41675](https://insights.sbomify.com/CVE-2025-41675/): Remote Command Injection via GET in Cloud Server Communication Script Due to Improper Input Neutralization (high 7.2)
- [CVE-2025-41678](https://insights.sbomify.com/CVE-2025-41678/): SQL Injection via POST Requests Allowing Configuration Database Manipulation (medium 6.5)
- [CVE-2025-41676](https://insights.sbomify.com/CVE-2025-41676/): Resource Exhaustion via POST Requests to send-sms Action (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-41679 and fix it if it is affected.

What it is: CVE-2025-41679 is a medium-severity memory corruption vulnerability in Helmholz REX 100, published on 21 Jul 2025. 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-2025-41679 in the wild and no public exploit code.

Affected product: Helmholz REX 100. 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-2025-41679/ (Markdown: https://insights.sbomify.com/CVE-2025-41679/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-41679
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-41679
- OSV: https://osv.dev/vulnerability/CVE-2025-41679

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-41679/
Summaries are generated and may contain mistakes; the official description above is the record.