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CVE-2025-4831: Critical Buffer Overflow Vulnerability in TOTOLINK Routers

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Overview

CVE-2025-4831 is a critical vulnerability that has been identified in popular TOTOLINK router models such as A702R, A3002R and A3002RU with version 3.0.0-B20230809.1615. This vulnerability, originating from a faulty HTTP POST Request Handler, could potentially result in a system compromise or data leakage. Exploitation of this vulnerability could be initiated remotely, making it a significant threat to any organization or individual using the affected routers. It’s crucial to understand the nature of this threat, its potential impacts, and how to mitigate it.

Vulnerability Summary

CVE ID: CVE-2025-4831
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

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Product | Affected Versions

TOTOLINK A702R | 3.0.0-B20230809.1615
TOTOLINK A3002R | 3.0.0-B20230809.1615
TOTOLINK A3002RU | 3.0.0-B20230809.1615

How the Exploit Works

The vulnerability lies in the HTTP POST request handler of the affected routers. Specifically, an unknown part of the file /boafrm/formSiteSurveyProfile is prone to a buffer overflow vulnerability when the ‘submit-url’ argument is manipulated. This can lead to unpredictable behavior including program crashes, incorrect operation, or even execution of arbitrary code.

Conceptual Example Code

Here is a conceptual example of how an HTTP POST request might be manipulated to exploit this vulnerability:

POST /boafrm/formSiteSurveyProfile HTTP/1.1
Host: target_router_ip
Content-Type: application/x-www-form-urlencoded
submit-url=<malicious_payload>

In this example, “ would be a carefully crafted string designed to overflow the buffer and potentially inject malicious code into the system.

Recommended Mitigation

The most effective mitigation strategy is to apply the vendor’s patch for this vulnerability. In the absence of a patch, or until it can be applied, utilizing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can be configured to block or alert on any attempts to exploit this vulnerability by monitoring for unusual or malicious HTTP POST requests.

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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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