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CVE-2025-6487: Critical Buffer Overflow Vulnerability in TOTOLINK A3002R

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Overview

CVE-2025-6487 is a critical vulnerability found in TOTOLINK A3002R 1.1.1-B20200824.0128 that could allow malicious users to potentially compromise the system or cause data leakage. The vulnerability affects the function formRoute of the file /boafrm/formRoute. Cybersecurity professionals, network administrators, and users of this product should pay close attention to this vulnerability due to its high severity and the fact that it can be exploited remotely.

Vulnerability Summary

CVE ID: CVE-2025-6487
Severity: Critical, CVSS Score 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Possible system compromise and data leakage

Affected Products

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Product | Affected Versions

TOTOLINK A3002R | 1.1.1-B20200824.0128

How the Exploit Works

The vulnerability lies in the handling of the ‘subnet’ argument in the function formRoute of the file /boafrm/formRoute. An unchecked manipulation of the ‘subnet’ argument can lead to a stack-based buffer overflow. A buffer overflow occurs when the volume of data exceeds the storage capacity of the buffer, causing the extra information to overflow into adjacent buffers. In this case, an attacker can exploit this vulnerability by sending a specially crafted request with a manipulated ‘subnet’ argument, causing the buffer to overflow and enabling the execution of arbitrary code.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. This is a simplified representation and the actual attack would require a specifically crafted malicious payload.

POST /boafrm/formRoute HTTP/1.1
Host: target-router-ip
Content-Type: application/x-www-form-urlencoded
subnet=255.255.255.0&overflowing_data=AAAAAAAAAAAAAAAA...

In the above example, an excessively long value is used for the ‘overflowing_data’ parameter, causing the buffer to overflow and potentially allowing the execution of the ‘overflowing_data’ as code.

Mitigations

To mitigate this vulnerability, users are advised to apply the vendor-supplied patch as soon as possible. In the meantime, or in cases where applying the patch is not immediately possible, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) may be used as temporary mitigations. These systems should be configured to detect and block attempts to exploit this vulnerability by monitoring for unusual or excessively long ‘subnet’ argument values.

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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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