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CVE-2025-55587: Critical Buffer Overflow Vulnerability in TOTOLINK A3002R v4.0.0-B20230531.1404

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Overview

This report provides a detailed analysis of a critical buffer overflow vulnerability, CVE-2025-55587, discovered in TOTOLINK A3002R routers. The vulnerability affects the router’s hostname parameter and can enable attackers to cause a Denial of Service (DoS) attack. Given the severity of the vulnerability, it is imperative for users and administrators to understand its mechanism and apply the necessary mitigation strategies.

Vulnerability Summary

CVE ID: CVE-2025-55587
Severity: Critical, CVSS score 7.5
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service (DoS), potential system compromise, and data leakage

Affected Products

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Product | Affected Versions

TOTOLINK A3002R | v4.0.0-B20230531.1404

How the Exploit Works

The vulnerability resides in the hostname parameter at /boafrm/formMapDelDevice. Attackers can exploit this vulnerability by sending a specially crafted input that exceeds the buffer capacity of the hostname parameter. This causes an overflow condition, which can lead to a DoS condition, system compromise, or data leakage.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This example simulates an HTTP POST request with an overly large ‘hostname’ value.

POST /boafrm/formMapDelDevice HTTP/1.1
Host: vulnerable.router.com
Content-Type: application/x-www-form-urlencoded
hostname=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA... (continued)

In this example, the ‘A’s represent an input that is significantly larger than what the hostname parameter can handle, causing a buffer overflow condition.

Mitigation Guidance

TOTOLINK has released a patch to address this vulnerability. Users and administrators are strongly advised to apply the update as soon as possible. As a temporary mitigation measure, users can also deploy a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to monitor and block malicious traffic.

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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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