# CVE-2025-40946: Hardcoded credentials in blueplanet 100 NX3 M8

> Attackers can derive Technical Service credentials from device serial numbers using a weak CRC16 algorithm to gain unauthorized access to Siemens blueplanet inverters.

- **Severity:** High 7.2 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 May 2026
- **Updated:** 13 Oct 2026
- **Also known as:** GHSA-5pqm-29j4-2vjr

## What is CVE-2025-40946?

CVE-2025-40946 is a high-severity vulnerability in Siemens blueplanet 100 NX3 M8, published on 12 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability has been identified in blueplanet 100 NX3 M8 (All versions), blueplanet 100 TL3 GEN2 (All versions < V6.1.4.9), blueplanet 105 TL3 (All versions < V3.92), blueplanet 105 TL3 GEN2 (All versions < V6.1.4.9), blueplanet 110 TL3 (All versions < V3.92), blueplanet 125 NX3 M10 (All versions), blueplanet 125 TL3 (All versions < V3.92), blueplanet 125 TL3 GEN2 (All versions < V6.1.4.9), blueplanet 137 TL3 (All versions < V3.92), blueplanet 150 TL3 (All versions < V3.92), blueplanet 150 TL3 GEN2 (All versions < V6.1.4.9), blueplanet 155 TL3 (All versions < V3.92), blueplanet 155 TL3 GEN2 (All versions < V6.1.4.9), blueplanet 165 TL3 (All versions < V3.92), blueplanet 165 TL3 GEN2 (All versions < V6.1.4.9), blueplanet 3.0 TL3-60.0 TL3 (All versions), blueplanet 87.0 TL3 (All versions < V3.92), blueplanet 87.0 TL3 GEN2 (All versions < V6.1.4.9), blueplanet 92.0 TL3 (All versions < V3.92), blueplanet 92.0 TL3 GEN2 (All versions < V6.1.4.9), blueplanet gridsave 110 TL3-S (All versions < V3.91), blueplanet gridsave 137 TL3-S (All versions < V3.91), blueplanet gridsave 92.0 TL3-S (All versions < V3.91). A CRC16-based algorithm for generating Technical Service credentials could allow an attacker to derive the credentials from the devices serial number and misuse them to gain unauthorized access.

Weakness: CWE-321 (Use of Hard-coded Cryptographic Key)

## Which versions are affected by CVE-2025-40946?


## How do I fix CVE-2025-40946?

No fix has been published for CVE-2025-40946 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-40946 being exploited?

There is no known exploitation of CVE-2025-40946 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40946 and fix it if it is affected.

What it is: CVE-2025-40946 is a high-severity vulnerability in Siemens blueplanet 100 NX3 M8, published on 12 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-40946 in the wild and no public exploit code.

Affected product: Siemens blueplanet 100 NX3 M8. 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-2025-40946/ (Markdown: https://insights.sbomify.com/CVE-2025-40946/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40946
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40946
- OSV: https://osv.dev/vulnerability/CVE-2025-40946

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40946/
Summaries are generated and may contain mistakes; the official description above is the record.