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CVE-2025-5736: Critical Buffer Overflow Vulnerability in TOTOLINK X15

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Overview

A critical vulnerability has been discovered in TOTOLINK X15 1.0.0-B20230714.1105, a widely used router firmware version. This vulnerability, classified as CVE-2025-5736, is of significant concern as it allows the remote execution of buffer overflow attacks. Buffer overflow attacks can lead to severe consequences, including system compromise and potential data leakage, if not addressed promptly. Therefore, understanding this vulnerability, its effects, and how to mitigate it is crucial for all users and administrators of TOTOLINK X15.

Vulnerability Summary

CVE ID: CVE-2025-5736
Severity: Critical (8.8 CVSS Score)
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 X15 | 1.0.0-B20230714.1105

How the Exploit Works

The vulnerability resides in an unknown function of the file /boafrm/formNtp, part of the HTTP POST Request Handler. Specifically, the manipulation of the ‘submit-url’ argument can trigger a buffer overflow. In a buffer overflow attack, a hacker sends more data to a buffer than it can handle, which overflows the buffer’s boundary and overwrites adjacent memory. This can lead to unexpected behavior, including erroneous data, a crash, or a breach of system security.

Conceptual Example Code

The following is a conceptual example demonstrating how this vulnerability could be exploited. The attacker sends an HTTP POST request to the target with an oversized ‘submit-url’ argument, causing the buffer overflow:

POST /boafrm/formNtp HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=http://[oversized_data]

Mitigation

Users and administrators of TOTOLINK X15 1.0.0-B20230714.1105 are advised to apply the vendor patch as soon as possible to mitigate this critical vulnerability. If the patch cannot be applied immediately, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. These systems can help detect and block attacks that attempt to exploit 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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