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CVE-2025-7910: Critical Buffer Overflow Vulnerability in D-Link DIR-513

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Overview

A critical vulnerability, tagged as CVE-2025-7910, has been identified in D-Link DIR-513 routers version 1.10. This vulnerability is of significant concern as it affects the function sprintf of the file /goform/formSetWanNonLogin of the Boa Webserver component. The vulnerability could be exploited remotely, and the exploit has been publicly disclosed, making the affected systems a potential target for cybercriminals. Given the criticality of this vulnerability, it is crucial for users and administrators to understand the risks involved and take necessary precautions.

Vulnerability Summary

CVE ID: CVE-2025-7910
Severity: Critical (8.8 CVSS Score)
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 DIR-513 | 1.10

How the Exploit Works

The vulnerability emanates from an incorrect use of the sprintf function in the file /goform/formSetWanNonLogin of the Boa Webserver component, leading to a stack-based buffer overflow. This vulnerability is triggered when an excessively long ‘curTime’ argument is passed, causing the stack buffer to overflow. This overflow can be exploited by an attacker to execute arbitrary code or potentially compromise the system’s integrity and confidentiality.

Conceptual Example Code

Here is a
conceptual
example of how the vulnerability could be exploited using an HTTP request:

POST /goform/formSetWanNonLogin HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
curTime=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

In the above example, an excessively long ‘curTime’ argument is sent to the server, leading to a buffer overflow.

Mitigation and Recommendations

Affected users are advised to apply the vendor’s patch to correct this vulnerability. As this vulnerability affects products that are no longer supported by the maintainer, users are encouraged to upgrade to a newer, supported version of the product. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation strategy. These systems can detect and prevent exploitation attempts targeting this vulnerability.

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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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