CVE-2025-4145: Critical Buffer Overflow Vulnerability in Netgear EX6200 1.0.3.94

Overview

The CVE-2025-4145 is a critical security vulnerability discovered in Netgear’s EX6200 1.0.3.94. This vulnerability pertains to a buffer overflow issue affecting the function sub_3D0BC. If successfully exploited, this vulnerability could potentially lead to system compromise or data leakage. Considering the widespread use of Netgear devices, this vulnerability could have serious implications for numerous network users, heightening the need for swift mitigation actions.

Vulnerability Summary

CVE ID: CVE-2025-4145
Severity: Critical (CVSS 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

Netgear EX6200 | 1.0.3.94

How the Exploit Works

The vulnerability stems from incorrect handling of the ‘host’ argument within the ‘sub_3D0BC’ function. An attacker can exploit this vulnerability by sending a specially crafted request to manipulate the ‘host’ argument, causing a buffer overflow. This could potentially give the attacker control over the system or lead to unauthorized data access.

Conceptual Example Code

The following is a conceptual demonstration of how an attacker might exploit this vulnerability:

POST /sub_3D0BC/function HTTP/1.1
Host: vulnerable-host.com
Content-Type: application/json
{ "host": "A string long enough to cause a buffer overflow..." }

In this example, the ‘host’ argument is manipulated with an overly long string, causing a buffer overflow in the ‘sub_3D0BC’ function.

Mitigation Guidance

Due to the severity of the vulnerability, it is highly recommended for users to apply the vendor patch as soon as it is available. If the vendor patch is not available, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure to detect and block attempts to exploit this vulnerability. However, these measures are not a permanent solution and can only minimize the risk until a patch is applied.