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CVE-2025-5904: Critical Vulnerability in TOTOLINK T10 Invoking Buffer Overflow

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Overview

A critical vulnerability has been discovered in TOTOLINK T10 4.1.8cu.5207, a popular networking device used by businesses and individuals globally. The vulnerability, designated as CVE-2025-5904, impacts the function setWiFiMeshName of the file /cgi-bin/cstecgi.cgi in the POST Request Handler component.
This vulnerability is especially concerning as it can be exploited remotely, exposing a large number of devices to potential attacks. The exploit, which has been publicly disclosed, can lead to system compromise or data leakage, posing significant risks to the security and integrity of the affected systems.

Vulnerability Summary

CVE ID: CVE-2025-5904
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 T10 | 4.1.8cu.5207

How the Exploit Works

The vulnerability lies in the manipulation of the ‘device_name’ argument in the ‘setWiFiMeshName’ function. An attacker can remotely send a specially crafted POST request to the /cgi-bin/cstecgi.cgi file, manipulating the ‘device_name’ argument. This manipulation can trigger a buffer overflow, potentially leading to arbitrary code execution, system compromise, or data leakage.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited, using an HTTP request.

POST /cgi-bin/cstecgi.cgi HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
device_name=[malicious_payload]

In the above example, [malicious_payload] would be replaced by an attacker with a specially crafted payload designed to trigger the buffer overflow.

Mitigation

The users of the affected versions of TOTOLINK T10 are advised to apply the vendor patch as soon as it’s available. In the interim, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used to mitigate the risk by detecting and blocking malicious payloads targeting this vulnerability.

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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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