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CVE-2025-4731: Critical Buffer Overflow Vulnerability in TOTOLINK Routers

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Overview

The Common Vulnerabilities and Exposures (CVE) system has identified a critical vulnerability in TOTOLINK A3002R and A3002RU 3.0.0-B20230809.1615 routers. This vulnerability, assigned the identifier CVE-2025-4731, is located in an unspecified section of the file /boafrm/formPortFw, a component of the HTTP POST Request Handler. This vulnerability is of particular concern due to its potential for remote exploitation and the significant risks it poses to data security and system integrity.
Given the ubiquity of TOTOLINK routers in many networks, this vulnerability could potentially affect a significant number of systems globally. It represents a serious hazard as it may lead to system compromise or data leakage, making it a high priority for mitigation and remediation efforts.

Vulnerability Summary

CVE ID: CVE-2025-4731
Severity: Critical, CVSS Score: 8.8
Attack Vector: Network, via HTTP POST Request
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

TOTOLINK A3002R | 3.0.0-B20230809.1615
TOTOLINK A3002RU | 3.0.0-B20230809.1615

How the Exploit Works

The vulnerability arises from improper handling of the argument service_type/ip_subnet in a HTTP POST request to /boafrm/formPortFw. This can lead to buffer overflow, a condition where an application writes more data to a buffer than it can hold. This could potentially allow an attacker to overwrite adjacent memory locations and execute arbitrary code or cause a denial of service.

Conceptual Example Code

Below is a conceptual example of how an attacker might exploit this vulnerability. This is a mockup of a malicious HTTP POST request:

POST /boafrm/formPortFw HTTP/1.1
Host: vulnerable.router.com
Content-Type: application/x-www-form-urlencoded
service_type=ssh&ip_subnet=192.168.1.1' OR '1'='1' --

In this example, the attacker sends a crafted POST request with a manipulated service_type/ip_subnet argument. This causes a buffer overflow in the system, potentially leading to arbitrary code execution or denial of service.

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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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