Overview
A critical vulnerability, classified as CVE-2025-4449, has been discovered in D-Link DIR-619L 2.04B04 which could potentially lead to serious system compromise or data leakage. This issue is situated within the function formEasySetupWizard3, and arises from the manipulation of the argument wan_connected which results in buffer overflow. This vulnerability is particularly concerning as the attack may be initiated remotely, thus posing a significant threat to all users of the affected product. Despite the product no longer being supported by the maintainer, it is critical to understand and mitigate this issue due to the potential severity of the impact.
Vulnerability Summary
CVE ID: CVE-2025-4449
Severity: Critical – CVSS Score 8.8
Attack Vector: Remote
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 | 2.04B04
How the Exploit Works
The vulnerability resides in the formEasySetupWizard3 function of the D-Link DIR-619L 2.04B04. Specifically, the argument “wan_connected” is prone to manipulation, leading to a buffer overflow condition. Buffer overflow, in this context, means that data that exceeds the buffer’s capacity is written into adjacent memory spaces. This can cause unexpected behaviors, such as crashes, incorrect data processing, or even execution of malicious code. The attack can be initiated remotely without any user interaction, making it a serious threat.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited using a malicious HTTP request:
POST /formEasySetupWizard3 HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
wan_connected=OVERFLOW_PAYLOADIn this example, `OVERFLOW_PAYLOAD` would be replaced with a crafted string that causes the buffer overflow. This could potentially allow the execution of unauthorized code or commands on the targeted system.
Mitigation
Users are advised to apply patches as provided by the vendor to mitigate this vulnerability. In case the patch is unavailable, dependent on a product’s lifecycle status, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can offer temporary mitigation. These systems can potentially identify and block attempts to exploit this vulnerability.