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CVE-2025-6887: Critical Buffer Overflow Vulnerability in Tenda AC5 15.03.06.47

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Overview

A critical vulnerability, designated as CVE-2025-6887, has been discovered in Tenda AC5 version 15.03.06.47, a popular networking device. This vulnerability emanates from an unknown functionality of the file /goform/SetSysTimeCfg and can be exploited remotely, posing a severe threat to system security and data integrity.
The vulnerability has a CVSS severity score of 8.8, indicating its potential for severe damage. Any successful exploit could compromise the system or lead to data leakage, which makes it a matter of urgent concern for all Tenda AC5 users and cybersecurity professionals.

Vulnerability Summary

CVE ID: CVE-2025-6887
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

Tenda AC5 | 15.03.06.47

How the Exploit Works

The vulnerability resides in the /goform/SetSysTimeCfg file of the Tenda AC5 system. By manipulating the ‘time/timeZone’ argument, an attacker can trigger a stack-based buffer overflow. This overflow could then allow the attacker to execute arbitrary code or disrupt the normal functioning of the system, leading to a potential system compromise or data leakage.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited using a malicious HTTP POST request:

POST /goform/SetSysTimeCfg HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
time=malicious_payload&timeZone=malicious_payload

In the above request, ‘malicious_payload’ is a placeholder for the actual exploit code that would cause the buffer overflow.

Recommendations

Users of the affected Tenda AC5 version are strongly recommended to apply the vendor patch as soon as possible. If the patch cannot be applied immediately, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation measures, providing some protection against potential attacks exploiting this vulnerability.

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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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