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CVE-2025-5739: Critical Buffer Overflow Vulnerability in TOTOLINK X15 HTTP POST Request Handler

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Overview

The cybersecurity landscape is under constant attack, with new vulnerabilities emerging almost daily. The latest threat to join this list is CVE-2025-5739, a critical vulnerability found in TOTOLINK X15 version 1.0.0-B20230714.1105. This vulnerability is present in the HTTP POST Request Handler component, specifically affecting an unknown part of the file /boafrm/formSaveConfig. Given the critical rating of this vulnerability, there is a substantial risk to data security and system integrity for any organization using the affected versions of TOTOLINK X15. Understanding and mitigating this threat is essential for safeguarding your digital assets.

Vulnerability Summary

CVE ID: CVE-2025-5739
Severity: Critical (8.8 CVSS Score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

TOTOLINK X15 | 1.0.0-B20230714.1105

How the Exploit Works

The vulnerability exists due to improper handling of the ‘submit-url’ argument in the HTTP POST Request Handler component of TOTOLINK X15. By manipulating this argument, an attacker can cause a buffer overflow, which can lead to unexpected behavior, including the execution of arbitrary code or a crash of the affected process. This vulnerability can be exploited remotely by an unauthenticated attacker, making it especially dangerous.

Conceptual Example Code

Here is a conceptual example of how a malicious HTTP POST request exploiting this vulnerability might look:

POST /boafrm/formSaveConfig HTTP/1.1
Host: vulnerable-device.com
Content-Type: application/x-www-form-urlencoded
submit-url=%s

In this example, `%s` represents a string that is long enough to overflow the buffer.

Mitigation and Prevention

To mitigate this vulnerability, users are advised to apply the latest patches provided by the vendor as soon as they become available. In the interim, it is recommended to use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability. Furthermore, restricting access to the affected device to trusted networks and disabling unnecessary services can reduce the potential attack surface.

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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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