# CVE-2025-4978: Netgear DGND3700 Basic Authentication BRS_top.html improper authentication

> Remote attackers can bypass authentication on Netgear DGND3700 routers via the BRS_top.html file, gaining unauthorized access.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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:** 20 May 2025
- **Updated:** 20 May 2025
- **Also known as:** GHSA-x4gc-7rpm-6497

## What is CVE-2025-4978?

CVE-2025-4978 is a critical authentication bypass vulnerability in Netgear DGND3700, published on 20 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability, which was classified as very critical, was found in Netgear DGND3700 1.1.00.15_1.00.15NA. This affects an unknown part of the file /BRS_top.html of the component Basic Authentication. The manipulation leads to improper authentication. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. Other products might be affected as well. The vendor was contacted early about this disclosure.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2025-4978?

It affects 1 product.


Products: Netgear Dgnd3700 Firmware.

## How do I fix CVE-2025-4978?

No fix has been published for CVE-2025-4978 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-4978 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-4978 exists.

## Other vulnerabilities in Netgear DGND3700

- [CVE-2025-4977](https://insights.sbomify.com/CVE-2025-4977/): Netgear DGND3700 BRS_top.html information disclosure (medium 6.9)
- [CVE-2025-4980](https://insights.sbomify.com/CVE-2025-4980/): Netgear DGND3700 mini_http currentsetting.htm information disclosure (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-4978 and fix it if it is affected.

What it is: CVE-2025-4978 is a critical authentication bypass vulnerability in Netgear DGND3700, published on 20 May 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-2025-4978 exists.

Affected product: Netgear DGND3700. 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-2025-4978/ (Markdown: https://insights.sbomify.com/CVE-2025-4978/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-4978
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-4978
- OSV: https://osv.dev/vulnerability/CVE-2025-4978

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-4978/
Summaries are generated and may contain mistakes; the official description above is the record.