# CVE-2025-40593: File upload in SIMATIC CN 4100

> An attacker can cause a denial of service on SIMATIC CN 4100 devices by uploading arbitrary files to the SFTP folder.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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:** 8 Jul 2025
- **Updated:** 8 Jul 2025
- **Also known as:** GHSA-vm7p-h5v8-4m2j

## What is CVE-2025-40593?

CVE-2025-40593 is a high-severity vulnerability in Siemens SIMATIC CN 4100, published on 8 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0). The affected application allows to control the device by storing arbitrary files in the SFTP folder of the device. This could allow an attacker to cause a denial of service condition.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2025-40593?

It affects 1 product.


Products: Siemens Simatic Cn 4100 Firmware.

## How do I fix CVE-2025-40593?

No fix has been published for CVE-2025-40593 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-40593 being exploited?

There is no known exploitation of CVE-2025-40593 in the wild and no public exploit code.

## Other vulnerabilities in Siemens SIMATIC CN 4100

- [CVE-2024-32741](https://insights.sbomify.com/CVE-2024-32741/): Hardcoded credentials in SIMATIC CN 4100 (critical 10.0)
- [CVE-2023-29130](https://insights.sbomify.com/CVE-2023-29130/): Privilege escalation in SIMATIC CN 4100 (critical 9.9)
- [CVE-2024-32740](https://insights.sbomify.com/CVE-2024-32740/): Hardcoded credentials in SIMATIC CN 4100 (critical 9.8)
- [CVE-2023-49621](https://insights.sbomify.com/CVE-2023-49621/): Hardcoded credentials in SIMATIC CN 4100 (critical 9.8)
- [CVE-2025-40938](https://insights.sbomify.com/CVE-2025-40938/): Hardcoded credentials in SIMATIC CN 4100 (critical 9.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40593 and fix it if it is affected.

What it is: CVE-2025-40593 is a high-severity vulnerability in Siemens SIMATIC CN 4100, published on 8 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-40593 in the wild and no public exploit code.

Affected product: Siemens SIMATIC CN 4100. 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-2025-40593/ (Markdown: https://insights.sbomify.com/CVE-2025-40593/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40593
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40593
- OSV: https://osv.dev/vulnerability/CVE-2025-40593

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40593/
Summaries are generated and may contain mistakes; the official description above is the record.