CVE-2025-4368: Critical Buffer Overflow Vulnerability in Tenda AC8 16.03.34.06

Overview

The CVE-2025-4368 is a crucial cybersecurity vulnerability identified in the Tenda AC8 16.03.34.06 router. This vulnerability, classified as critical, is particularly concerning because it allows potential attackers to launch a system compromise or data leakage remotely. With the exploit now disclosed to the public, the threat is more significant, making it imperative for users and administrators utilizing this device to take immediate action to mitigate the risks.

Vulnerability Summary

CVE ID: CVE-2025-4368
Severity: Critical; CVSS Score: 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Tenda AC8 | 16.03.34.06

How the Exploit Works

The vulnerability lies in the function formGetRouterStatus of the file /goform/MtuSetMacWan. An attacker can manipulate the argument ‘shareSpeed’ leading to buffer overflow. Buffer overflow is a common software vulnerability where a program overruns the buffer’s boundary and overwrites adjacent memory locations. This compromise can cause unexpected behavior such as errors, crashes, and in the worst-case scenario, the execution of harmful instructions.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited in a HTTP request:

POST /goform/MtuSetMacWan HTTP/1.1
Host: <router_ip>
Content-Type: application/x-www-form-urlencoded
shareSpeed=<malicious_payload>

In the above example, `` is the IP address of the vulnerable Tenda router, and `` represents the manipulated ‘shareSpeed’ argument designed to trigger the buffer overflow.

Further Mitigation Guidance

The recommended mitigation step is to apply the vendor’s patch. However, if the patch is not immediately available or cannot be applied for any reason, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. These systems can be configured to block or alert on traffic patterns that match the exploit. However, this is not a full-proof solution and is only recommended until the vendor’s patch can be applied. Regularly updating software and maintaining proper cybersecurity hygiene can help prevent future vulnerabilities.