# CVE-2017-6872: Missing authorization in OZW672, OZW772

> An attacker with network access to port 21 can read or modify historical measurement data on Siemens OZW672 and OZW772 devices due to missing authentication.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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:** 8 Aug 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-x4mx-m5p4-fmg7

## What is CVE-2017-6872?

CVE-2017-6872 is a medium-severity missing authorization vulnerability in OZW672, OZW772, published on 8 Aug 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was discovered in Siemens OZW672 (all versions) and OZW772 (all versions) that could allow an attacker with access to port 21/tcp to access or alter historical measurement data stored on the device.

Weakness: CWE-668 (Exposure of Resource to Wrong Sphere), CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2017-6872?

It affects 2 products.


Products: Siemens Ozw672 Firmware, Siemens Ozw772 Firmware.

## How do I fix CVE-2017-6872?

No fix has been published for CVE-2017-6872 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-6872 being exploited?

There is no known exploitation of CVE-2017-6872 in the wild and no public exploit code.

## Other vulnerabilities in OZW672, OZW772

- [CVE-2025-26389](https://insights.sbomify.com/CVE-2025-26389/): Command injection in OZW672 (critical 10.0)
- [CVE-2025-26390](https://insights.sbomify.com/CVE-2025-26390/): SQL injection in OZW672 (critical 9.3)
- [CVE-2024-36140](https://insights.sbomify.com/CVE-2024-36140/): Cross-site scripting in OZW672 (high 8.2)
- [CVE-2019-13941](https://insights.sbomify.com/CVE-2019-13941/): Information disclosure in OZW672 (high 7.5)
- [CVE-2017-6873](https://insights.sbomify.com/CVE-2017-6873/): Security feature bypass in OZW672, OZW772 (high 7.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-6872 and fix it if it is affected.

What it is: CVE-2017-6872 is a medium-severity missing authorization vulnerability in OZW672, OZW772, published on 8 Aug 2017. 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-2017-6872 in the wild and no public exploit code.

Affected product: OZW672, OZW772. 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-2017-6872/ (Markdown: https://insights.sbomify.com/CVE-2017-6872/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-6872
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-6872
- OSV: https://osv.dev/vulnerability/CVE-2017-6872

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-6872/
Summaries are generated and may contain mistakes; the official description above is the record.