CVE-2025-4299: Critical Remote Buffer Overflow Vulnerability in Tenda AC1206

Overview

A critical vulnerability, CVE-2025-4299, has been discovered in the Tenda AC1206 up to version 15.03.06.23. This vulnerability is a significant threat because it allows an attacker to remotely manipulate a buffer overflow condition, potentially leading to system compromise and data leakage. Given the increasing reliance on wireless access technologies, this vulnerability could have severe implications for both individuals and organizations who fail to adequately patch or mitigate the risk.

Vulnerability Summary

CVE ID: CVE-2025-4299
Severity: Critical (CVSS: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: Not required
Impact: Potential system compromise and data leakage

Affected Products

Product | Affected Versions

Tenda AC1206 | Up to 15.03.06.23

How the Exploit Works

The exploit leverages the vulnerability found in the function ‘setSchedWifi’ of the file ‘/goform/openSchedWifi’. An attacker can remotely initiate a buffer overflow condition by sending an oversized data packet to this function. Once the buffer is overflowed, the attacker can execute arbitrary code, potentially gaining control of the system or leaking sensitive information.

Conceptual Example Code

Here is a conceptual example of how an attacker might exploit the vulnerability. Please note this is purely illustrative and not actual exploit code.

POST /goform/openSchedWifi HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "SSID": "NormalSSID",
"password": "NormalPassword",
"extra_payload": "aaaaaa...[continue until buffer overflow]..." }

In this example, the “extra_payload” field contains an excessive amount of data designed to overflow the buffer. Once the buffer is filled, the additional data could overwrite other memory areas, potentially leading to arbitrary code execution.

Mitigation

It’s recommended to apply the vendor patch as soon as possible. In the interim, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation. Ensure that these systems are configured to detect and block potential buffer overflow attacks.