# CVE-2021-46304: Missing authorization in CP-8000 MASTER MODULE WITH I/O -25/+70°C

> An attacker can retrieve sensitive debug information, including network topology, from Siemens CP-8000 modules if the web server module is activated.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Aug 2022
- **Updated:** 20 Oct 2025
- **Also known as:** GHSA-v82p-wrg2-wj3m

## What is CVE-2021-46304?

CVE-2021-46304 is a medium-severity missing authorization vulnerability in Siemens CP-8000 MASTER MODULE WITH I/O -25/+70°C, published on 10 Aug 2022. 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 CP-8000 MASTER MODULE WITH I/O -25/+70°C (All versions), CP-8000 MASTER MODULE WITH I/O -40/+70°C (All versions), CP-8021 MASTER MODULE (All versions), CP-8022 MASTER MODULE WITH GPRS (All versions). The component allows to activate a web server module which provides unauthenticated access to its web pages. This could allow an attacker to retrieve debug-level information from the component such as internal network topology or connected systems.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2021-46304?

It affects 4 products.


Products: Siemens Cp-8000 Master Module With I\/O -25\/\+70 Firmware, Siemens Cp-8000 Master Module With I\/O -40\/\+70 Firmware, Siemens Cp-8021 Master Module Firmware, Siemens Cp-8022 Master Module With Gprs Firmware.

## How do I fix CVE-2021-46304?

No fix has been published for CVE-2021-46304 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-46304 being exploited?

There is no known exploitation of CVE-2021-46304 in the wild and no public exploit code.

## Other vulnerabilities in Siemens CP-8000 MASTER MODULE WITH I/O -25/+70°C

- [CVE-2021-45033](https://insights.sbomify.com/CVE-2021-45033/): Hardcoded credentials in CP-8000 MASTER MODULE WITH I/O -25/+70°C (high 8.8)
- [CVE-2021-45034](https://insights.sbomify.com/CVE-2021-45034/): Information disclosure in CP-8000 MASTER MODULE WITH I/O -25/+70°C (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-46304 and fix it if it is affected.

What it is: CVE-2021-46304 is a medium-severity missing authorization vulnerability in Siemens CP-8000 MASTER MODULE WITH I/O -25/+70°C, published on 10 Aug 2022. 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-2021-46304 in the wild and no public exploit code.

Affected product: Siemens CP-8000 MASTER MODULE WITH I/O -25/+70°C. 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-2021-46304/ (Markdown: https://insights.sbomify.com/CVE-2021-46304/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-46304
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-46304
- OSV: https://osv.dev/vulnerability/CVE-2021-46304

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-46304/
Summaries are generated and may contain mistakes; the official description above is the record.