# CVE-2020-25234: Hardcoded credentials in LOGO! 8 BM (incl. SIPLUS variants)

> Attackers can reverse engineer user-defined functions from LOGO! program files because password protection is only enforced by the viewer software.

- **Severity:** High 7.7 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A: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:** 14 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-66q5-93c3-xq5w

## What is CVE-2020-25234?

CVE-2020-25234 is a high-severity vulnerability in Siemens LOGO! 8 BM (incl. SIPLUS variants), published on 14 Dec 2020. 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 LOGO! 8 BM (incl. SIPLUS variants) (All versions < V8.3), LOGO! Soft Comfort (All versions < V8.3). The LOGO! program files generated and used by the affected components offer the possibility to save user-defined functions (UDF) in a password protected way. This protection is implemented in the software that displays the information. An attacker could reverse engineer the UDFs directly from stored program files.

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

## Which versions are affected by CVE-2020-25234?

It affects 1 product.


Products: Siemens Logo\! 8 Bm Firmware.

## How do I fix CVE-2020-25234?

No fix has been published for CVE-2020-25234 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-25234 being exploited?

There is no known exploitation of CVE-2020-25234 in the wild and no public exploit code.

## Other vulnerabilities in Siemens LOGO! 8 BM (incl. SIPLUS variants)

- [CVE-2020-25228](https://insights.sbomify.com/CVE-2020-25228/): Missing authorization in LOGO! 8 BM (incl. SIPLUS variants) (critical 9.8)
- [CVE-2020-7593](https://insights.sbomify.com/CVE-2020-7593/): Memory corruption in LOGO! 8 BM (incl. SIPLUS variants) (critical 9.8)
- [CVE-2020-7589](https://insights.sbomify.com/CVE-2020-7589/): Missing authorization in LOGO! 8 BM (incl. SIPLUS variants) (critical 9.1)
- [CVE-2020-25229](https://insights.sbomify.com/CVE-2020-25229/): Weak cryptography in LOGO! 8 BM (incl. SIPLUS variants) (high 7.5)
- [CVE-2020-25230](https://insights.sbomify.com/CVE-2020-25230/): Weak cryptography in LOGO! 8 BM (incl. SIPLUS variants) (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-25234 and fix it if it is affected.

What it is: CVE-2020-25234 is a high-severity vulnerability in Siemens LOGO! 8 BM (incl. SIPLUS variants), published on 14 Dec 2020. 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-2020-25234 in the wild and no public exploit code.

Affected product: Siemens LOGO! 8 BM (incl. SIPLUS variants). 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-2020-25234/ (Markdown: https://insights.sbomify.com/CVE-2020-25234/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-25234
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-25234
- OSV: https://osv.dev/vulnerability/CVE-2020-25234

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-25234/
Summaries are generated and may contain mistakes; the official description above is the record.