# Improper certificate validation in Siemens COMOS V10.6 and others

CVE record · `CVE-2025-40801`

- **Identifiers:** `CVE-2025-40801`
- **State:** Confirmed
- **Severity:** CVSS 9.2 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** siemens
- **Weakness (CWE):** [CWE-295](https://cwe.mitre.org/data/definitions/295.html)
- **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md)
- **Technologies:** [Siemens COMOS V10.6](https://agentprime.io/advisories/technology/siemens-comos-v10-6.md) · [Siemens JT Bi-Directional Translator for STEP](https://agentprime.io/advisories/technology/siemens-jt-bi-directional-translator-for-step.md) · [Siemens NX V2412](https://agentprime.io/advisories/technology/siemens-nx-v2412.md) · [Siemens NX V2506](https://agentprime.io/advisories/technology/siemens-nx-v2506.md) · [Siemens Simcenter 3D](https://agentprime.io/advisories/technology/siemens-simcenter-3d.md) · [Siemens Simcenter Femap](https://agentprime.io/advisories/technology/siemens-simcenter-femap.md) · [Siemens Simcenter Studio](https://agentprime.io/advisories/technology/siemens-simcenter-studio.md) · [Siemens Simcenter System Architect](https://agentprime.io/advisories/technology/siemens-simcenter-system-architect.md) · [Siemens Tecnomatix Plant Simulation](https://agentprime.io/advisories/technology/siemens-tecnomatix-plant-simulation.md)
- **Published:** 9 Dec 2025
- **Updated:** 10 Mar 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: siemens) at 9 Dec 2025, 10:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Critical

Critical, because:

- CVSS score 9.2: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Siemens. Product: COMOS V10.6.
  - affected: `before V10.6.1` (custom)
  - Other versions: unknown
- Vendor: Siemens. Product: COMOS V10.6.
  - affected: `before V10.6.1` (custom)
  - Other versions: unknown
- Vendor: Siemens. Product: JT Bi-Directional Translator for STEP.
  - affected: `before *` (custom)
  - Other versions: unknown
- Vendor: Siemens. Product: NX V2412.
  - affected: `before V2412.8900` (custom)
  - Other versions: unknown
- Vendor: Siemens. Product: NX V2506.
  - affected: `before V2506.6000` (custom)
  - Other versions: unknown
- Vendor: Siemens. Product: Simcenter 3D.
  - affected: `before V2506.6000` (custom)
  - Other versions: unknown
- Vendor: Siemens. Product: Simcenter Femap.
  - affected: `before V2506.0002` (custom)
  - Other versions: unknown
- Vendor: Siemens. Product: Simcenter Studio.
  - affected: `before V2506.0001` (custom)
  - Other versions: unknown
- Vendor: Siemens. Product: Simcenter System Architect.
  - affected: `before V2506.0001` (custom)
  - Other versions: unknown
- Vendor: Siemens. Product: Tecnomatix Plant Simulation.
  - affected: `before V2504.0007` (custom)
  - Other versions: unknown

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 8.1 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`, from CNA (siemens)
- 9.2 Critical, CVSS 4.0: `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`, from CNA (siemens) (used for this record)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0026, the 18th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 9 Dec 2025. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2025-40801](https://www.cve.org/CVERecord?id=CVE-2025-40801)
- [NVD: CVE-2025-40801](https://nvd.nist.gov/vuln/detail/CVE-2025-40801)

### References from the CNA

- <https://cert-portal.siemens.com/productcert/html/ssa-710408.html>
- <https://cert-portal.siemens.com/productcert/html/ssa-212953.html>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2025-40801>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2025-40801/>. Everything for agents: <https://agentprime.io/llms.txt>.