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CVE-2025-6336: Critical Buffer Overflow Vulnerability in TOTOLINK EX1200T Router

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Overview

The cybersecurity community has identified an alarming vulnerability in the TOTOLINK EX1200T router. The flaw resides in the 4.1.2cu.5232_B20210713 version of this router and has been classified as critical due to its potential to compromise systems or lead to data leakage. The vulnerability affects an unknown function of the HTTP POST Request Handler within the file /boafrm/formTmultiAP. Attackers can exploit this flaw remotely, which significantly increases its potential reach and impact.

Vulnerability Summary

CVE ID: CVE-2025-6336
Severity: Critical (CVSS 8.8)
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

TOTOLINK EX1200T | 4.1.2cu.5232_B20210713

How the Exploit Works

The vulnerability lies in the manipulation of the ‘submit-url’ argument. Specifically, an attacker can send a specially crafted HTTP POST request to the ‘/boafrm/formTmultiAP’ endpoint. The malicious request causes a buffer overflow in the target system. Since the HTTP POST Request Handler does not properly validate the ‘submit-url’ parameter, it can lead to an overflow of the buffer, which can subsequently cause a system crash or allow arbitrary code execution.

Conceptual Example Code

Here is a conceptual example of how this vulnerability might be exploited. Please note that this is a hypothetical example and does not contain actual malicious code.

POST /boafrm/formTmultiAP HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=<malicious_payload>

In the above example, “ represents a string of characters crafted to overflow the buffer.

Mitigation

Currently, the best course of action for affected users is to apply the vendor-provided patch. For additional protection or in cases where applying the patch is not immediately possible, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation by monitoring the network for signs of this exploit. Regularly updating and patching software can also help prevent the exploitation of this and other vulnerabilities.

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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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