# CVE-2025-29931: Denial of service in TeleControl Server Basic

> Unauthenticated remote attackers can cause a partial denial of service in redundant setups by exploiting improper length validation in serialized messages.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/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:** 17 Apr 2025
- **Updated:** 17 Apr 2025
- **Also known as:** GHSA-5659-7353-7w5p

## What is CVE-2025-29931?

CVE-2025-29931 is a medium-severity denial of service vulnerability in Siemens Telecontrol Server Basic, published on 17 Apr 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 TeleControl Server Basic (All versions < V3.1.2.2). The affected product does not properly validate a length field in a serialized message which it uses to determine the amount of memory to be allocated for deserialization. This could allow an unauthenticated remote attacker to cause the application to allocate exhaustive amounts of memory and subsequently create a partial denial of service condition.
Successful exploitation is only possible in redundant Telecontrol Server Basic setups and only if the connection between the redundant servers has been disrupted.

Weakness: CWE-130 (Improper Handling of Length Parameter Inconsistency)

## Which versions are affected by CVE-2025-29931?

It affects 1 product.


Products: Siemens Telecontrol Server Basic.

## How do I fix CVE-2025-29931?

No fix has been published for CVE-2025-29931 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-29931 being exploited?

There is no known exploitation of CVE-2025-29931 in the wild and no public exploit code.

## Other vulnerabilities in Siemens Telecontrol Server Basic

- [CVE-2024-44102](https://insights.sbomify.com/CVE-2024-44102/): Deserialization in PP TeleControl Server Basic 1000 to 5000 V3.1 (critical 10.0)
- [CVE-2025-40765](https://insights.sbomify.com/CVE-2025-40765/): Information disclosure in TeleControl Server Basic V3.1 (critical 9.3)
- [CVE-2025-27495](https://insights.sbomify.com/CVE-2025-27495/): SQL injection in TeleControl Server Basic (critical 9.3)
- [CVE-2025-27539](https://insights.sbomify.com/CVE-2025-27539/): SQL injection in TeleControl Server Basic (critical 9.3)
- [CVE-2025-27540](https://insights.sbomify.com/CVE-2025-27540/): SQL injection in TeleControl Server Basic (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-29931 and fix it if it is affected.

What it is: CVE-2025-29931 is a medium-severity denial of service vulnerability in Siemens Telecontrol Server Basic, published on 17 Apr 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-2025-29931 in the wild and no public exploit code.

Affected product: Siemens Telecontrol Server Basic. 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-2025-29931/ (Markdown: https://insights.sbomify.com/CVE-2025-29931/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-29931
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-29931
- OSV: https://osv.dev/vulnerability/CVE-2025-29931

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-29931/
Summaries are generated and may contain mistakes; the official description above is the record.