# CVE-2025-41732: Stack-based buffer overflow via unsafe sscanf in check_cookie()

> Unauthenticated remote attackers can achieve full device compromise via stack-based buffer overflow in the cookie check function.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Dec 2025
- **Updated:** 18 Dec 2025
- **Also known as:** GHSA-cprc-hgv2-3jr8

## What is CVE-2025-41732?

CVE-2025-41732 is a critical memory corruption vulnerability in WAGO Indsutrial-Managed-Switches, published on 10 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An unauthenticated remote attacker can abuse unsafe sscanf calls within the check_cookie() function to write arbitrary data into fixed-size stack buffers which leads to full device compromise.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2025-41732?

It affects 2 products.


Products: Wago 0852-1322 Firmware, Wago 0852-1328 Firmware.

## How do I fix CVE-2025-41732?

No fix has been published for CVE-2025-41732 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-41732 being exploited?

There is no known exploitation of CVE-2025-41732 in the wild and no public exploit code.

## Other vulnerabilities in WAGO Indsutrial-Managed-Switches

- [CVE-2025-41730](https://insights.sbomify.com/CVE-2025-41730/): Stack-based buffer overflow via unsafe sscanf in check_account() (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-41732 and fix it if it is affected.

What it is: CVE-2025-41732 is a critical memory corruption vulnerability in WAGO Indsutrial-Managed-Switches, published on 10 Dec 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-2025-41732 in the wild and no public exploit code.

Affected product: WAGO Indsutrial-Managed-Switches. 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-2025-41732/ (Markdown: https://insights.sbomify.com/CVE-2025-41732/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-41732
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-41732
- OSV: https://osv.dev/vulnerability/CVE-2025-41732

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-41732/
Summaries are generated and may contain mistakes; the official description above is the record.