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CVE-2025-4829: Critical Buffer Overflow Vulnerability in TOTOLINK HTTP POST Request Handler

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Overview

A critical vulnerability, CVE-2025-4829, has been identified in TOTOLINK A702R, A3002R, and A3002RU 3.0.0-B20230809.1615. This vulnerability is significant due to its potential impact on the security of these devices, which could lead to system compromise or data leakage. It affects the HTTP POST Request Handler component of these TOTOLINK products, and specifically the function sub_40BE30 of the file /boafrm/formStats. By manipulating the argument “submit-url”, a buffer overflow can be triggered, allowing the attacker to execute arbitrary code on the system.

Vulnerability Summary

CVE ID: CVE-2025-4829
Severity: Critical (8.8/10 CVSS score)
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 A702R | 3.0.0-B20230809.1615
TOTOLINK A3002R | 3.0.0-B20230809.1615
TOTOLINK A3002RU | 3.0.0-B20230809.1615

How the Exploit Works

This exploit works by sending a HTTP POST request with a specially crafted “submit-url” argument to the “sub_40BE30” function of the /boafrm/formStats file in the affected TOTOLINK products. The manipulation of this argument leads to a buffer overflow, which can be used by a malicious actor to execute arbitrary code on the system.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This is a simulated HTTP POST request, which sends a malicious payload to the vulnerable system.

POST /boafrm/formStats HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=<malicious_payload>

Please note that the actual content of the “ would be crafted carefully to exploit the buffer overflow vulnerability and possibly allow arbitrary code execution.
In conclusion, this vulnerability is of high importance due to its critical severity and potential impact on system security. Users are advised to apply the necessary patches provided by the vendor or use Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation.

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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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