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CVE-2025-5672: Critical Buffer Overflow Vulnerability in TOTOLINK N302R Plus

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Overview

The cybersecurity community is currently dealing with a critical vulnerability in TOTOLINK N302R Plus, an issue that potentially puts countless systems at risk. Identified as CVE-2025-5672, this vulnerability resides in an unknown functionality of the file /boafrm/formFilter of the component HTTP POST Request Handler. It is especially concerning due to its high severity and the fact that it can be exploited remotely, making it a significant threat to both businesses and individuals using the affected product.
The vulnerability is a buffer overflow, a common but severe type of security flaw that can lead to system compromise or data leakage. This vulnerability is particularly worrisome as the exploit has been disclosed to the public and may be actively used by malicious actors.

Vulnerability Summary

CVE ID: CVE-2025-5672
Severity: Critical, CVSS score 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 N302R Plus | Versions up to 3.4.0-B20201028

How the Exploit Works

The exploit works by manipulating the ‘url’ argument in the HTTP POST Request Handler. This leads to a buffer overflow, a situation where more data is put into a buffer than it can handle. This can cause the excess data to overflow into adjacent memory spaces, potentially leading to unauthorized access to information or system control.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This is a hypothesized HTTP request that causes the buffer overflow.

POST /boafrm/formFilter HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "url": "http://example.com/[...excessive number of characters...]" }

In this example, the ‘url’ argument is filled with an excessive number of characters, causing a buffer overflow in the HTTP POST Request Handler.

Mitigation

To mitigate this vulnerability, users of the affected versions of TOTOLINK N302R Plus are encouraged to apply the vendor patch. If this is not immediately possible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as temporary mitigation. However, these only provide temporary protection and do not address the root cause of the vulnerability, so applying the vendor patch should be prioritized.

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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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