# CVE-2025-14673: gmg137 snap7-rs client.rs as_ct_write heap-based overflow

> A heap-based buffer overflow in the snap7-rs library allows remote attackers to execute arbitrary code or cause denial of service.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Dec 2025
- **Updated:** 24 Feb 2026
- **Also known as:** GHSA-rw74-fqrf-pr2q

## What is CVE-2025-14673?

CVE-2025-14673 is a medium-severity memory corruption vulnerability in gmg137 snap7-rs, published on 14 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in gmg137 snap7-rs up to 1.142.1. Affected is the function snap7_rs::client::S7Client::as_ct_write of the file /tests/snap7-rs/src/client.rs. The manipulation leads to heap-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-122 (Heap-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-14673?

It affects 1 product.


Products: Gmg137 Snap7-Rs.

## How do I fix CVE-2025-14673?

No fix has been published for CVE-2025-14673 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-14673 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-14673 exists.

## Other vulnerabilities in gmg137 snap7-rs

- [CVE-2025-15247](https://insights.sbomify.com/CVE-2025-15247/): gmg137 snap7-rs client.rs download heap-based overflow (medium 6.9)
- [CVE-2025-14672](https://insights.sbomify.com/CVE-2025-14672/): gmg137 snap7-rs s7_micro_client.cpp opWriteArea heap-based overflow (medium 6.9)
- [CVE-2025-7616](https://insights.sbomify.com/CVE-2025-7616/): gmg137 snap7-rs Public API pthread_cond_destroy memory corruption (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-14673 and fix it if it is affected.

What it is: CVE-2025-14673 is a medium-severity memory corruption vulnerability in gmg137 snap7-rs, published on 14 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-14673 exists.

Affected product: gmg137 snap7-rs. 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-2025-14673/ (Markdown: https://insights.sbomify.com/CVE-2025-14673/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-14673
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-14673
- OSV: https://osv.dev/vulnerability/CVE-2025-14673

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-14673/
Summaries are generated and may contain mistakes; the official description above is the record.