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CVE-2025-7762: Critical Buffer Overflow Vulnerability in D-Link DI-8100

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Overview

A critical vulnerability has been identified in D-Link DI-8100 16.07.26A1 router software. The vulnerability, designated as CVE-2025-7762, has been found to affect the HTTP Request Handler component, specifically the processing of the /menu_nat_more.asp file. If exploited, this vulnerability can lead to a stack-based buffer overflow, which may compromise the system or lead to significant data leakage. Given that the exploit has been publicly disclosed, it is crucial for users and administrators to understand the implications and take necessary measures to secure their systems.

Vulnerability Summary

CVE ID: CVE-2025-7762
Severity: Critical; CVSS Score: 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

D-Link DI-8100 | 16.07.26A1

How the Exploit Works

The vulnerability exists due to insufficient boundary checking in the HTTP Request Handler while processing the /menu_nat_more.asp file. This allows attackers to send an overly large, specially crafted HTTP request to overflow the buffer and overwrite the stack, which may lead to arbitrary code execution.

Conceptual Example Code

Here’s a conceptual example of a malicious HTTP request that could exploit this vulnerability:

GET /menu_nat_more.asp HTTP/1.1
Host: vulnerable-router.com
Content-Type: text/html
{ "menu_item": "A"*1024 }

In this example, the “menu_item” parameter is filled with a large number of ‘A’ characters (1024 in this case) to overflow the buffer. An attacker could replace these ‘A’ characters with malicious code to exploit the buffer overflow and gain unauthorized access or control of the system.

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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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