Overview
A critical buffer overflow vulnerability (CVE-2025-4450) has been discovered in D-Link DIR-619L 2.04B04, specifically within the function formSetEasy_Wizard. This vulnerability, if exploited, can potentially allow an attacker to compromise the system or leak sensitive data. Buffer overflow vulnerabilities are notoriously lethal as they can provide attackers with the ability to execute arbitrary code on the target system, leading to a full system compromise. It is particularly concerning as the affected product – D-Link DIR-619L 2.04B04 – is no longer supported by the vendor, leaving the users without an official security patch from the manufacturer.
Vulnerability Summary
CVE ID: CVE-2025-4450
Severity: Critical (8.8 CVSS Score)
Attack Vector: Remote
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-619L | 2.04B04
How the Exploit Works
The vulnerability occurs due to improper handling of the ‘curTime’ argument within the ‘formSetEasy_Wizard’ function. By manipulating this argument, an attacker can cause a buffer overflow condition. This can give the attacker the ability to execute code remotely on the target system, which can potentially lead to a full system compromise or data leakage.
Conceptual Example Code
The exploit might be conducted in a manner similar to the example HTTP request below:
POST /formSetEasy_Wizard HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
curTime=10000000000000000000000000000000000000000000000...The attacker sends an HTTP request to the ‘formSetEasy_Wizard’ function with an excessively long ‘curTime’ value, causing the buffer to overflow and enabling the attacker to execute arbitrary code on the system.
Recommended Mitigation
As the vendor no longer supports the affected product, applying a vendor patch is not an option. As a temporary measure, users are advised to implement a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to help detect and prevent exploitation attempts. For long-term mitigation, users should consider replacing the unsupported hardware with a newer model that receives regular security updates from the vendor.