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CVE-2025-4978: Critical Authentication Vulnerability in Netgear DGND3700

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Overview

A severe vulnerability, classified as very critical, has been discovered in Netgear DGND3700 firmware version 1.1.00.15_1.00.15NA. This vulnerability, identified as CVE-2025-4978, pertains to an unknown part of the file /BRS_top.html of the component Basic Authentication. The manipulation of this component can lead to improper authentication. As a result, unauthorized entities may gain access and control over the system. This vulnerability is particularly concerning as it can be initiated remotely, potentially affecting a significant number of users globally.
The existence of this exploit has been publicly disclosed and may be utilized by malicious entities for nefarious purposes. Therefore, it is crucial to understand the implications of this vulnerability and implement the suggested mitigation strategies as soon as possible.

Vulnerability Summary

CVE ID: CVE-2025-4978
Severity: Very Critical, CVSS Score 9.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

Netgear DGND3700 | 1.1.00.15_1.00.15NA

How the Exploit Works

This exploit works by manipulating the /BRS_top.html file of the Basic Authentication component in the Netgear DGND3700 firmware. By executing a successful attack, the improper authentication process allows unauthorized access to the system. This vulnerability can be initiated remotely, which means an attacker does not need physical access to the device.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. Please note that this is purely for educational purposes.

GET /BRS_top.html HTTP/1.1
Host: target.device.ip.address
HTTP/1.1 200 OK
Content-Type: text/html
<script>
// code to manipulate authentication
</script>

In this conceptual example, an HTTP GET request is made to the /BRS_top.html file. It is then manipulated through the addition of malicious script code, compromising the authentication process.

Recommended Mitigation

Users are advised to apply the vendor patch as soon as it is available. In the meantime, they can use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation strategy.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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