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CVE-2025-6825: Critical Buffer Overflow Vulnerability in TOTOLINK A702R

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Overview

A critical vulnerability, identified as CVE-2025-6825, has been discovered in TOTOLINK A702R routers up to version 4.0.0-B20230721.1521. This flaw lies within an unspecified functionality of the file /boafrm/formWlSiteSurvey, which is part of the HTTP POST Request Handler component. The vulnerability is of significant concern as it can be exploited remotely and may compromise the entire system or result in data leakage. Given the widespread use of TOTOLINK routers, the potential impact of this vulnerability is immense and demands immediate attention.

Vulnerability Summary

CVE ID: CVE-2025-6825
Severity: Critical, CVSS score 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Possible system compromise and data leakage

Affected Products

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Product | Affected Versions

TOTOLINK A702R | Up to version 4.0.0-B20230721.1521

How the Exploit Works

The exploit targets the argument ‘submit-url’ in the HTTP POST Request Handler component of the router’s firmware. By sending a specially crafted request, an attacker can manipulate this argument to trigger a buffer overflow. This overflow can subsequently lead to system instability, unauthorized access, or even remote command execution. The potential for remote exploitation coupled with the absence of any user interaction makes this a particularly dangerous vulnerability.

Conceptual Example Code

An attacker might exploit this vulnerability with a malicious HTTP POST request similar to the following:

POST /boafrm/formWlSiteSurvey HTTP/1.1
Host: vulnerable.router.com
Content-Type: application/x-www-form-urlencoded
submit-url=<malicious_payload>

In this example, `` would be a string designed to overflow the buffer associated with the ‘submit-url’ argument, potentially leading to unexpected behavior or unauthorized access.

Remediation

As a mitigation measure, users are advised to apply the vendor’s patch as soon as it becomes available. In the meantime, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary mitigation against potential attacks exploiting this vulnerability. However, it is critical to note that these are temporary solutions and cannot fully eliminate the risks associated with this vulnerability. Regular patching and system updates remain the most effective defense against such threats.

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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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