Overview
In the world of cybersecurity, a newly discovered vulnerability has been identified in Belkin F9K1122 version 1.00.33. This critical vulnerability, designated CVE-2025-7089, affects the function formWanTcpipSetup of the web component. The potential impact of this vulnerability ranges from system compromise to data leakage, putting users and their sensitive data at serious risk. Given that Belkin devices are frequently used in both home and business settings, understanding and mitigating this vulnerability is of the utmost importance.
Vulnerability Summary
CVE ID: CVE-2025-7089
Severity: Critical, with a CVSS score of 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
Escape the Surveillance Era
Most apps won’t tell you the truth.
They’re part of the problem.
Phone numbers. Emails. Profiles. Logs.
It’s all fuel for surveillance.
Ameeba Chat gives you a way out.
- • No phone number
- • No email
- • No personal info
- • Anonymous aliases
- • End-to-end encrypted
Chat without a trace.
Product | Affected Versions
Belkin F9K1122 | 1.00.33
How the Exploit Works
The vulnerability lies in the improper handling of the argument ‘pppUserName’ in the ‘formWanTcpipSetup’ function. By manipulating this argument, an attacker can cause a stack-based buffer overflow. This could potentially allow the attacker to execute arbitrary code on the victim’s system, leading to system compromise or data leakage. The exploit can be initiated remotely and does not require any user interaction or privileges, making it especially dangerous.
Conceptual Example Code
Here is a conceptual example of how this vulnerability might be exploited. This is not a real exploit, but a hypothetical scenario to illustrate the nature of the vulnerability.
POST /goform/formWanTcpipSetup HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
pppUserName=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...[continued until buffer overflow is triggered]...In this example, an excessively long ‘pppUserName’ value is sent to the vulnerable endpoint. This could potentially trigger a buffer overflow, leading to unintended consequences such as arbitrary code execution or data leakage.
Mitigation and Countermeasures
Given the vendor’s lack of response to this issue, it is recommended to apply a patch from a trusted third-party source, if available. If no patch is available, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as temporary mitigation. These systems can potentially detect and block attempts to exploit this vulnerability. However, these are not permanent solutions and users are encouraged to apply patches as soon as they become available.