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CVE-2025-6292: Critical Vulnerability in D-Link DIR-825 2.03 Leads to Stack-Based Buffer Overflow

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Overview

Recently, a critical vulnerability was discovered in D-Link DIR-825 2.03, a widely used version of the D-Link router. This vulnerability has been classified as a stack-based buffer overflow, which can lead to severe consequences including potential system compromise or data leakage. Given that the affected products are no longer supported by the manufacturer, it’s urgent for end-users, administrators, and organizations reliant on these products to take immediate action to mitigate the risks associated with this vulnerability.

Vulnerability Summary

CVE ID: CVE-2025-6292
Severity: Critical (CVSS: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

D-Link | DIR-825 2.03

How the Exploit Works

The vulnerability exists within the function sub_4091AC of the component HTTP POST Request Handler. An attacker can exploit this vulnerability by sending a specially crafted HTTP POST request that includes an oversized payload. The server’s buffer, unable to handle the excessive data, overflows, potentially allowing an attacker to execute arbitrary code or cause a denial of service.

Conceptual Example Code

Here is a conceptual example of how an attacker could potentially exploit this vulnerability. This code is presented for illustrative purposes only:

POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "oversized_payload": "A"*10000 }

In this example, ‘A’*10000 represents an oversized payload that exceeds the buffer’s capacity, leading to buffer overflow.

Recommended Mitigation

Given that this vulnerability affects products no longer supported by the vendor, applying a vendor patch is not possible. In such circumstances, it is recommended to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. These systems can be configured to detect and block malicious HTTP POST requests sent to exploit this vulnerability. For a permanent solution, consider upgrading to a supported version of the product or switching to a different product entirely.

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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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