Overview
The cybersecurity world is once again on high alert following the discovery of a critical vulnerability in D-Link DIR-513 1.10. This vulnerability, identified as CVE-2025-8169, potentially impacts millions of users worldwide, and is particularly concerning given that the affected products are no longer supported by the maintainer. Due to its severity and the possible consequences of exploitation, understanding and mitigating this vulnerability is of utmost importance for all users of the affected products.
Vulnerability Summary
CVE ID: CVE-2025-8169
Severity: Critical (CVSS: 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 DIR-513 | 1.10
How the Exploit Works
The vulnerability stems from a buffer overflow in the HTTP POST Request Handler of the D-Link DIR-513 1.10. By manipulating the ‘curTime’ argument in the ‘formSetWanPPTPcallback’ function of the ‘/goform/formSetWanPPTPpath’ file, an attacker can overflow the buffer, causing the system to act unpredictably or crash. This can potentially provide an attacker with unauthorized access to the system, leading to system compromise and data leakage.
Conceptual Example Code
Here’s a conceptual example of a malicious HTTP POST request that may exploit this vulnerability:
POST /goform/formSetWanPPTPpath HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
curTime=1234567...[continue until buffer overflow]In this example, the ‘curTime’ argument is filled with a large amount of data, likely far exceeding the buffer’s capacity, leading to a buffer overflow. This could potentially crash the system or enable the attacker to execute arbitrary code, depending on the specific implementation of the buffer.
Mitigation Guidance
Unfortunately, as the affected product is no longer supported by D-Link, no official patches will be released to address this vulnerability. As a temporary measure, users can deploy a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and prevent exploitation attempts. However, given the severity of this vulnerability, the most secure course of action would be to replace the affected routers with more recent, supported models.