# CVE-2025-40801: Weak cryptography in COMOS V10.6

> Missing server certificate validation in SALT SDK allows man-in-the-middle attacks, exposing data and bypassing security controls in Siemens engineering tools.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Dec 2025
- **Updated:** 10 Mar 2026
- **Also known as:** GHSA-3p2p-55rm-xcvw

## What is CVE-2025-40801?

CVE-2025-40801 is a critical vulnerability in Siemens COMOS V10.6, published on 9 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 identified in COMOS V10.6 (All versions < V10.6.1), COMOS V10.6 (All versions < V10.6.1), JT Bi-Directional Translator for STEP (All versions), NX V2412 (All versions < V2412.8900 with Cloud Entitlement (bundled as NX X)), NX V2506 (All versions < V2506.6000 with Cloud Entitlement (bundled as NX X)), Simcenter 3D (All versions < V2506.6000 with Cloud Entitlement (bundled as Simcenter X Mechanical)), Simcenter Femap (All versions < V2506.0002 with Cloud Entitlement (bundled as Simcenter X Mechanical)), Simcenter Studio (All versions < V2506.0001), Simcenter System Architect (All versions < V2506.0001), Tecnomatix Plant Simulation (All versions < V2504.0007). The SALT SDK is missing server certificate validation while establishing TLS connections to the authorization server. This could allow an attacker to perform a man-in-the-middle attack.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2025-40801?


## How do I fix CVE-2025-40801?

No fix has been published for CVE-2025-40801 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-40801 being exploited?

There is no known exploitation of CVE-2025-40801 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40801 and fix it if it is affected.

What it is: CVE-2025-40801 is a critical vulnerability in Siemens COMOS V10.6, published on 9 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-2025-40801 in the wild and no public exploit code.

Affected product: Siemens COMOS V10.6. 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-2025-40801/ (Markdown: https://insights.sbomify.com/CVE-2025-40801/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40801
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40801
- OSV: https://osv.dev/vulnerability/CVE-2025-40801

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40801/
Summaries are generated and may contain mistakes; the official description above is the record.