Overview
A critical vulnerability, identified as CVE-2025-4146, has been discovered in Netgear EX6200 firmware version 1.0.3.94. This vulnerability can potentially compromise the entire system or lead to data leakage if successfully exploited. The risk is particularly significant as it affects the sub_41940 function and can be launched remotely, posing a severe threat to all users of this firmware version.
This vulnerability matters tremendously because of its severity and the potential impact it could have on users’ data security. The vendor’s lack of response adds to the critical nature of the issue, leaving users vulnerable and without an official patch to mitigate the risk.
Vulnerability Summary
CVE ID: CVE-2025-4146
Severity: Critical (CVSS: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
No phone number, email, or personal info required.
Product | Affected Versions
Netgear EX6200 | 1.0.3.94
How the Exploit Works
The exploit works by manipulating the “host” argument in the sub_41940 function. This manipulation leads to a buffer overflow, which in turn could allow an attacker to execute arbitrary code or cause the system to crash. The vulnerability can be exploited remotely, and no specific user interaction or privileges are required to carry out the attack.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited. This example represents a malicious HTTP request exploiting the buffer overflow:
POST /sub_41940 HTTP/1.1
Host: vulnerable.netgear_device.com
Content-Type: application/x-www-form-urlencoded
host=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In the above example, the “host” parameter is filled with an excessively long string of “A” characters, causing a buffer overflow.
Mitigation Guidance
At the time of writing, the vendor has not released a patch. However, until a patch is available, users can use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation. These tools can help detect and block attempts to exploit this vulnerability. Users should also consider disabling remote management features if they are not required and always ensure that their systems and devices are behind firewalls.