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CVE-2025-5848: Critical Buffer Overflow Vulnerability in Tenda AC15 15.03.05.19_multi

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Overview

The vulnerability identified as CVE-2025-5848 represents a significant threat to the security of networks that employ Tenda AC15 15.03.05.19_multi. This vulnerability, categorized as critical, exposes the networks to potential compromise, data leakage, or even full system takeover. The vulnerability is exploited through a buffer overflow attack vector on the function formSetPPTPUserList of the file /goform/setPptpUserList, which can be manipulated remotely.

Vulnerability Summary

CVE ID: CVE-2025-5848
Severity: Critical (CVSS Score: 8.8)
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

Tenda AC15 | 15.03.05.19_multi

How the Exploit Works

The vulnerability CVE-2025-5848 is a result of improper input validation in the function formSetPPTPUserList of the file /goform/setPptpUserList. The component HTTP POST Request Handler is affected by this issue. Attackers manipulate the argument list, leading to a buffer overflow. In essence, the attacker sends more data than the buffer can handle, causing it to overflow and overwrite other memory locations. This can lead to erratic application behavior or even execution of arbitrary code.

Conceptual Example Code

An attacker might exploit this vulnerability by sending a malicious HTTP POST request like the following:

POST /goform/setPptpUserList HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
username=legitimate_user&password=legitimate_password&list=OVERFLOW_DATA

In the above example, `OVERFLOW_DATA` represents an excessively large amount of data designed to overflow the buffer.

Mitigation

The best course of action to mitigate this vulnerability is to apply the vendor’s patch as soon as it is available. In the interim, the use of a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary mitigation against potential exploits. Also, it is advisable to limit the exposure of the vulnerable system to the internet and restrict access to trusted networks only.

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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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