CVE-2025-3328: Buffer Overflow Vulnerability in Tenda AC1206 Could Lead to System Compromise

Overview

The vulnerability CVE-2025-3328 is a critical security flaw that has been found in Tenda AC1206 15.03.06.23, a popular router model. This vulnerability affects the function form_fast_setting_wifi_set and could potentially lead to a system compromise or data leakage. The severity of this vulnerability lies in its capacity to be exploited remotely, which means that attackers do not need physical access to the device. Moreover, the exploit has already been disclosed publicly, increasing the potential for its misuse.

Vulnerability Summary

CVE ID: CVE-2025-3328
Severity: Critical (CVSS 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

Product | Affected Versions

Tenda AC1206 | 15.03.06.23

How the Exploit Works

The vulnerability resides in the function form_fast_setting_wifi_set of the file /goform/fast_setting_wifi_set. The manipulation of the argument ssid/timeZone leads to a buffer overflow. This occurs when more data is written to a buffer than it can handle, causing it to overwrite adjacent memory. This can corrupt data, crash the system, or allow the execution of malicious code. In this case, a successful exploit could allow an attacker to execute arbitrary code on the system.

Conceptual Example Code

This is a conceptual example of how the vulnerability could be exploited using a malicious HTTP request:

POST /goform/fast_setting_wifi_set HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "ssid": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...",
"timeZone": "..." }

In this example, the “ssid” parameter is filled with more characters than the buffer can handle, causing a buffer overflow.

Countermeasures

To mitigate this vulnerability, it is recommended to apply the vendor patch as soon as it is available. Until then, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation. Regular monitoring and patching of systems can also reduce the risk of future vulnerabilities.