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CVE-2025-11123: Critical Remote Stack-Based Buffer Overflow Vulnerability in Tenda AC18

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Overview

A critical flaw has been identified in the Tenda AC18 wireless router, specifically in the 15.03.05.19 version. This vulnerability, registered as CVE-2025-11123, affects an unknown function of the file /goform/saveAutoQos and can be exploited remotely by attackers. Exhibiting a high CVSS severity score of 8.8, this vulnerability is a serious concern for users and organizations that utilize Tenda AC18 routers in their network infrastructure. This vulnerability warrants immediate attention due to its potential for system compromise and data leakage.

Vulnerability Summary

CVE ID: CVE-2025-11123
Severity: Critical (CVSS: 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 AC18 | 15.03.05.19

How the Exploit Works

The vulnerability allows an attacker to cause a stack-based buffer overflow through manipulation of the ‘enable’ argument in the /goform/saveAutoQos file. This overflow can potentially lead to an attacker executing arbitrary code on the system, thereby gaining unauthorized access. The attacker doesn’t require any user interaction or privileges to exploit this vulnerability, increasing the risk factor.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. This example uses an HTTP POST request to send a malicious payload to the vulnerable endpoint.

POST /goform/saveAutoQos HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "enable": "malicious_code_that_causes_buffer_overflow" }

In the above example, `malicious_code_that_causes_buffer_overflow` represents the payload that an attacker might use to trigger the buffer overflow vulnerability.

Mitigation Guidance

To mitigate this vulnerability, users and administrators should immediately apply the patch provided by the vendor. If the patch is not available or cannot be applied immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation measure to detect and prevent exploit attempts. Regular monitoring of system logs and network traffic can also aid in identifying potential attacks.

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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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