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CVE-2025-7084: Critical Buffer Overflow Vulnerability in Belkin F9K1122

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Overview

A critical vulnerability, identified as CVE-2025-7084, has been discovered in Belkin F9K1122 firmware version 1.00.33. This vulnerability resides in the formWpsStart function of the /goform/formWpsStart file and is associated with the webs component of the system. It exposes users to a potential system compromise or data leakage, making this vulnerability a serious concern that deserves immediate attention. The exploit related to this vulnerability has been made public, creating an urgent need for users to apply the available vendor patches or implement effective mitigation strategies.

Vulnerability Summary

CVE ID: CVE-2025-7084
Severity: Critical (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Belkin F9K1122 | 1.00.33

How the Exploit Works

The exploit takes advantage of a stack-based buffer overflow in the formWpsStart function. By manipulating the pinCode argument, an attacker can overflow the buffer, potentially leading to arbitrary code execution. This vulnerability can be exploited remotely without any user interaction or special privileges, making it a potent threat.

Conceptual Example Code

Here is a
conceptual
example of how the vulnerability might be exploited. This example assumes an HTTP POST request to the /goform/formWpsStart endpoint, carrying a malicious payload in the pinCode field:

POST /goform/formWpsStart HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
pinCode=AAA...[long string]...AAA

The “AAA…[long string]…AAA” represents a long string that is intended to overflow the stack buffer. In a real-world attack, this would likely be replaced with carefully crafted input designed to cause a specific, attacker-controlled outcome.

Recommended Mitigation

As of now, the vendor has not issued any response or patch for this vulnerability. Until such a response is available, users can mitigate the risk by using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS). These systems can be configured to block or alert on any attempts to exploit this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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