Overview
The world of cybersecurity is fraught with constant threats to data security and system integrity. One such vulnerability, CVE-2025-6368, has been found in D-Link DIR-619L 2.06B01, posing a significant risk to systems still utilizing this unsupported product. This vulnerability is particularly concerning, as it has a high CVSS Severity Score of 8.8 and the potential for system compromise or data leakage. With the exploit details already disclosed to the public, systems running the affected software are at an increased risk of being targeted.
Vulnerability Summary
CVE ID: CVE-2025-6368
Severity: Critical (8.8 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
D-Link DIR-619L | 2.06B01
How the Exploit Works
The vulnerability arises from an issue in the formSetEmail function of the /goform/formSetEmail file. The manipulation of the argument curTime/config.smtp_email_subject results in a stack-based buffer overflow. This kind of overflow occurs when a program writes more data to a buffer located on the stack than what is actually allocated for that buffer. This excess data then overflows into adjacent memory locations, overwriting the information there. This can lead to erratic program behavior, crashes, and in some cases, the execution of arbitrary code.
Conceptual Example Code
Here is a conceptual example of how an attack could be initiated remotely. Assuming the attacker knows the vulnerable endpoint, they could send a malicious HTTP POST request similar to the following:
POST /goform/formSetEmail HTTP/1.1
Host: vulnerable-device.example.com
Content-Type: application/x-www-form-urlencoded
curTime=config.smtp_email_subject&value=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In this example, the “value” field is filled with a long string of “A” characters, which could cause a stack-based buffer overflow in the vulnerable system.
Mitigation Guidance
Given that the affected product is no longer supported by the vendor, the ideal solution of applying a vendor patch is not available. As a temporary mitigation measure, users can implement a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to filter out malicious requests that could exploit this vulnerability. Long-term, users should consider upgrading to a supported version or alternative product to maintain a secure environment.