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CVE-2025-6147: Critical Buffer Overflow Vulnerability in TOTOLINK A702R Router

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Overview

In the constantly evolving field of cybersecurity, new vulnerabilities are discovered regularly, posing threats to various software and hardware. The latest in this list is a critical vulnerability found in TOTOLINK A702R 4.0.0-B20230721.1521, a widely used router. This vulnerability, identified as CVE-2025-6147, affects the unknown code of the file /boafrm/formSysLog in the HTTP POST Request Handler component. The significance of this vulnerability lies in its potential to allow remote attackers to execute a buffer overflow attack, leading to system compromise and data leakage.

Vulnerability Summary

CVE ID: CVE-2025-6147
Severity: Critical (CVSS: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

TOTOLINK A702R | 4.0.0-B20230721.1521

How the Exploit Works

The exploit targets the HTTP POST Request Handler component in the TOTOLINK A702R router. Specifically, it affects an unknown part of the code in the /boafrm/formSysLog file. The vulnerability is triggered when the ‘submit-url’ argument is manipulated, leading to a buffer overflow. This flaw allows an attacker to remotely overflow the buffer with arbitrary data, which can potentially lead to arbitrary code execution, thereby compromising the system and potentially leading to data leaks.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. In this case, a malicious HTTP POST request is sent to the target, with a manipulated ‘submit-url’ argument in the request body, causing a buffer overflow.

POST /boafrm/formSysLog HTTP/1.1
Host: target.totolink.com
Content-Type: application/x-www-form-urlencoded
submit-url=http://%s/%s&%s=<OVERFLOWED BUFFER DATA>

Mitigation and Prevention

As the vulnerability has been publicly disclosed, it is essential to apply mitigation strategies promptly. The official vendor has released a patch to address this vulnerability. Users are strongly encouraged to apply this patch as soon as possible to their TOTOLINK A702R routers.
In addition to applying the vendor patch, users can use Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) as temporary mitigation measures. These systems can help detect and block malicious traffic that attempts to exploit this vulnerability.
To conclude, the discovery of the CVE-2025-6147 vulnerability underscores the importance of regular patch management and the use of security tools like WAF and IDS to enhance the overall security posture of your systems and networks.

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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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