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CVE-2025-6130: Critical Buffer Overflow Vulnerability in TOTOLINK EX1200T 4.1.2cu.5232_B20210713

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Overview

A critical security vulnerability, labeled as CVE-2025-6130, has been identified in TOTOLINK EX1200T 4.1.2cu.5232_B20210713 that can potentially compromise the system or lead to data leakage. This vulnerability is of particular concern due to its ability to be exploited remotely, posing a significant risk to all systems utilizing the vulnerable version of this software. This blog post aims to provide an in-depth understanding of the vulnerability, its potential impact, and the necessary steps to mitigate it.

Vulnerability Summary

CVE ID: CVE-2025-6130
Severity: Critical (CVSS Score 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

TOTOLINK EX1200T | 4.1.2cu.5232_B20210713

How the Exploit Works

The CVE-2025-6130 vulnerability is a result of insufficient boundary checks in the HTTP POST Request Handler during processing of the file /boafrm/formStats. This oversight allows an attacker to trigger a buffer overflow by sending an oversized HTTP POST request. The overflow can overwrite critical data structures or inject malicious code, leading to potential system compromise or data leakage. The attack can be initiated remotely without any user interaction or privileges, making this vulnerability extremely dangerous.

Conceptual Example Code

Here is a conceptual example illustrating how a potential HTTP POST request might exploit this vulnerability:

POST /boafrm/formStats HTTP/1.1
Host: target.example.com
Content-Length: 100000
{ "malicious_payload": "A".repeat(100000) }

In this example, the payload length is significantly larger than expected, leading to a buffer overflow when the server attempts to process the request.

Mitigation Guidance

The best course of action to mitigate this vulnerability is to apply the vendor patch as soon as it is available. In situations where applying the patch immediately is not feasible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary measure can help minimize the risk. These mechanisms can be configured to detect and block oversized HTTP POST requests to the vulnerable endpoint, providing a temporary layer of protection until the patch is applied.

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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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