Overview
A critical vulnerability has been discovered in D-Link DIR-619L 2.06B01, identified as CVE-2025-6616. The vulnerability is found in the function formSetWAN_Wizard51 of the file /goform/formSetWAN_Wizard51. It is classified as critical due to its potential impact on the system which could lead to full system compromise or data leakage. The exploit can be initiated remotely and has been disclosed to the public, raising the threat level. Unfortunately, this vulnerability affects products that are no longer supported by the maintainer, which means that the users of these products are left to their own devices in securing their systems.
Vulnerability Summary
CVE ID: CVE-2025-6616
Severity: Critical (8.8/10)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
How the Exploit Works
The CVE-2025-6616 exploit works by manipulating the ‘curTime’ argument in a specific function of the D-Link DIR-619L’s firmware. The function, known as ‘formSetWAN_Wizard51’, is vulnerable to a stack-based buffer overflow. By sending a specially crafted payload to this function, an attacker can cause a buffer overflow, which could potentially allow them to execute arbitrary code on the system.
Conceptual Example Code
The following is a conceptual example of how the vulnerability might be exploited. The attacker crafts a malicious payload designed to cause a buffer overflow in the ‘curTime’ argument:
POST /goform/formSetWAN_Wizard51 HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
curTime=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...+&other_parameters=...In this example, the ‘A’s represent the malicious payload that causes the buffer overflow. The ‘other_parameters’ represent other necessary parameters that might be needed for a successful request, which are beyond the scope of this example.
Mitigation Guidance
To mitigate this vulnerability, users are advised to apply any available vendor patches. However, since the affected product is no longer supported by the vendor, third-party solutions such as Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) may be used as temporary mitigation measures. Regularly monitoring network traffic for any suspicious activities can also help in early detection of potential exploits.