# CVE-2025-40581: Auth bypass in SCALANCE LPE9403

> A local attacker can bypass authentication in the SINEMA Remote Connect Edge Client to read and modify configuration parameters on SCALANCE LPE9403 devices.

- **Severity:** High 8.4 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 May 2025
- **Updated:** 8 Sep 2026
- **Also known as:** GHSA-xww6-q5p3-h6pp

## What is CVE-2025-40581?

CVE-2025-40581 is a high-severity authentication bypass vulnerability in Siemens SCALANCE LPE9403, published on 13 May 2025. 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 SCALANCE LPE9403 (6GK5998-3GS00-2AC2) (All versions < V2.1 HF0 with SINEMA Remote Connect Edge Client installed). Affected devices are vulnerable to an authentication bypass.
This could allow a non-privileged local attacker to bypass the authentication of the SINEMA Remote Connect Edge Client, and to read and modify the configuration parameters.

Weakness: CWE-288 (Authentication Bypass Using an Alternate Path or Channel)

## Which versions are affected by CVE-2025-40581?

It affects 1 product.


Products: Siemens Scalance Lpe9403 Firmware.

## How do I fix CVE-2025-40581?

No fix has been published for CVE-2025-40581 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-40581 being exploited?

There is no known exploitation of CVE-2025-40581 in the wild and no public exploit code.

## Other vulnerabilities in Siemens SCALANCE LPE9403

- [CVE-2023-27407](https://insights.sbomify.com/CVE-2023-27407/): Command injection in SCALANCE LPE9403 (critical 9.9)
- [CVE-2025-27396](https://insights.sbomify.com/CVE-2025-27396/): Privilege escalation in SCALANCE LPE9403 (high 8.7)
- [CVE-2025-27392](https://insights.sbomify.com/CVE-2025-27392/): Command injection in SCALANCE LPE9403 (high 8.6)
- [CVE-2025-27393](https://insights.sbomify.com/CVE-2025-27393/): Command injection in SCALANCE LPE9403 (high 8.6)
- [CVE-2025-27394](https://insights.sbomify.com/CVE-2025-27394/): Command injection in SCALANCE LPE9403 (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40581 and fix it if it is affected.

What it is: CVE-2025-40581 is a high-severity authentication bypass vulnerability in Siemens SCALANCE LPE9403, published on 13 May 2025. 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-2025-40581 in the wild and no public exploit code.

Affected product: Siemens SCALANCE LPE9403. 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-2025-40581/ (Markdown: https://insights.sbomify.com/CVE-2025-40581/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40581
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40581
- OSV: https://osv.dev/vulnerability/CVE-2025-40581

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40581/
Summaries are generated and may contain mistakes; the official description above is the record.