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CVE-2025-6886: Critical Buffer Overflow Vulnerability in Tenda AC5 15.03.06.47

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Overview

A severe vulnerability, identified as CVE-2025-6886, has been recently discovered within the Tenda AC5 15.03.06.47. This vulnerability is classified as critical and poses significant risks to the affected systems. It impacts an unknown functionality of the file /goform/openSchedWifi. The issue lies within the manipulation of the argument schedStartTime/schedEndTime which leads to a stack-based buffer overflow. This vulnerability is of particular concern as it can be exploited remotely and has the potential to compromise systems or leak sensitive data.

Vulnerability Summary

CVE ID: CVE-2025-6886
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 AC5 | 15.03.06.47

How the Exploit Works

The vulnerability exploits an unknown functionality in the file /goform/openSchedWifi. By manipulating the argument schedStartTime/schedEndTime, an attacker can trigger a stack-based buffer overflow. This overflow can lead to unauthorized execution of arbitrary code, system crashes, or information disclosure. It is worth noting that this attack can be launched remotely, making it a significant threat.

Conceptual Example Code

The following is a conceptual example of a malicious HTTP request that could potentially exploit this vulnerability:

POST /goform/openSchedWifi HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "schedStartTime": "large_string", "schedEndTime":"large_string" }

In this example, the ‘large_string’ is a long, crafted string designed to overflow the buffer and potentially execute arbitrary code or crash the system.

Mitigation and Recommendations

The best practice to mitigate this vulnerability is to apply the vendor’s patch as soon as it is available. For temporary mitigation, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can help prevent potential attacks. Regular monitoring and updating of your systems are also crucial to keep your environment secure.
Remember, cybersecurity is not a one-time event but an ongoing process. Stay informed about the latest threats and vulnerabilities and take proactive measures to protect your systems and data.

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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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