CVE-2025-50258: Buffer Overflow Vulnerability in Tenda AC6 Router

Overview

In the ever-evolving landscape of cybersecurity, a new vulnerability has been discovered in Tenda AC6 v15.03.05.16_multi routers. This vulnerability, identified as CVE-2025-50258, has been found to be susceptible to a buffer overflow attack via the SetSysTimeCfg function. This issue affects a wide range of users, from individual households to enterprise networks that use the vulnerable version of Tenda AC6 routers. The severity of this vulnerability lies in its potential to compromise systems or leak data, which is a significant threat to privacy and information security.

Vulnerability Summary

CVE ID: CVE-2025-50258
Severity: High (8.1 CVSS Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Tenda AC6 Router | v15.03.05.16_multi

How the Exploit Works

The vulnerability arises from a buffer overflow condition in the SetSysTimeCfg function of the Tenda AC6 router. A buffer overflow occurs when more data is written to a buffer than it can handle, causing an overflow of data into adjacent memory locations. In this case, the overflow is triggered via the time parameter, allowing a malicious attacker to execute arbitrary code or cause a denial of service.

Conceptual Example Code

Here’s a conceptual example of a malformed HTTP request that could exploit this vulnerability:

POST /SetSysTimeCfg HTTP/1.1
Host: target.router.ip
Content-Type: application/json
{
"time": "<buffer overflow inducing string>"
}

In the above example, `` would be replaced by a string that causes the buffer to overflow, potentially allowing arbitrary code execution.

Impact and Mitigation

The impact of this vulnerability is severe, as it could potentially allow an attacker to compromise the entire system or lead to data leakage. The CVSS score of 8.1 further emphasizes the severity of this vulnerability.
To mitigate this vulnerability, users are urged to apply the vendor patch as soon as it becomes available. In the meantime, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. These systems can detect and block suspicious activities, providing a layer of protection against potential attacks exploiting this vulnerability.