# CVE-2025-6931: D-Link DCS-6517/DCS-7517 Root Password Generation httpd generate_pass_from_mac entropy

> Remote attackers can predict root passwords due to insufficient entropy in MAC-based generation, leading to unauthorized access on unsupported D-Link cameras.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jun 2025
- **Updated:** 1 Jul 2025
- **Also known as:** GHSA-m79f-7mxr-wccp

## What is CVE-2025-6931?

CVE-2025-6931 is a medium-severity vulnerability in D-Link DCS-6517, published on 30 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability classified as problematic was found in D-Link DCS-6517 and DCS-7517 up to 2.02.0. Affected by this vulnerability is the function generate_pass_from_mac of the file /bin/httpd of the component Root Password Generation Handler. The manipulation leads to insufficient entropy. The attack can be launched remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-331 (Insufficient Entropy), CWE-330 (Use of Insufficiently Random Values)

## Which versions are affected by CVE-2025-6931?

It affects 2 products.


Products: Dlink Dcs-6517 Firmware, Dlink Dcs-7517 Firmware.

## How do I fix CVE-2025-6931?

No fix has been published for CVE-2025-6931 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-6931 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6931 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-6931 and fix it if it is affected.

What it is: CVE-2025-6931 is a medium-severity vulnerability in D-Link DCS-6517, published on 30 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6931 exists.

Affected product: D-Link DCS-6517. 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-2025-6931/ (Markdown: https://insights.sbomify.com/CVE-2025-6931/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-6931
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-6931
- OSV: https://osv.dev/vulnerability/CVE-2025-6931

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-6931/
Summaries are generated and may contain mistakes; the official description above is the record.