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CVE-2025-5624: Critical Stack-Based Buffer Overflow Vulnerability in D-Link DIR-816 1.10CNB05

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Overview

In the ever-evolving landscape of cybersecurity, a critical vulnerability has been discovered in the D-Link DIR-816 version 1.10CNB05. This vulnerability, termed as CVE-2025-5624, pertains to a stack-based buffer overflow that can potentially lead to system compromise or data leakage. It affects the QoSPortSetup function of the /goform/QoSPortSetup file. The vulnerability is of grave concern due to its high severity, remote attack capability, and the fact that it affects products that are no longer supported by the maintainer.

Vulnerability Summary

CVE ID: CVE-2025-5624
Severity: Critical – 9.8 CVSS v3
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System Compromise, Data Leakage

Affected Products

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Product | Affected Versions

D-Link DIR-816 | 1.10CNB05

How the Exploit Works

The exploit works by manipulating the argument port0_group/port0_remarker/ssid0_group/ssid0_remarker in the QoSPortSetup function of the /goform/QoSPortSetup file. This manipulation leads to a stack-based buffer overflow, which in turn can lead to system compromise or data leakage. The attack can be initiated remotely, and hence poses a significant threat to the affected systems.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This example represents a malicious HTTP request that might be used to trigger the buffer overflow:

POST /goform/QoSPortSetup HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
port0_group=AAAAAAAA...AAAA&port0_remarker=BBBBBBBB...BBBB&ssid0_group=CCCCCCCC...CCCC&ssid0_remarker=DDDDDDDD...DDDD

In the above example, ‘A’, ‘B’, ‘C’, and ‘D’ represent an excessive amount of data which triggers the stack-based buffer overflow.
It’s essential to note that this vulnerability only affects products that are no longer supported by the maintainer. Therefore, the recommended mitigation is to apply the vendor patch or use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation. As always, it’s recommended to upgrade to the latest supported versions of software whenever possible.

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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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