Overview

The vulnerability CVE-2025-50262 pertains to the Tenda AC6 v15.03.05.16_multi, which is susceptible to a buffer overflow attack. This vulnerability, if exploited, can lead to system compromise or data leakage. Given the severe potential impact, it is crucial for users and administrators of Tenda AC6 devices to understand the nature of this vulnerability and take immediate remedial measures.

Vulnerability Summary

CVE ID: CVE-2025-50262
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

Tenda AC6 | v15.03.05.16_multi

How the Exploit Works

The vulnerability arises from a buffer overflow in the formSetQosBand function. A malicious actor can exploit this by sending an overly large list parameter to this function. When the parameter exceeds the buffer limit, it could lead to a stack overflow that allows the attacker to execute arbitrary code or disrupt the system’s operation.

Conceptual Example Code

Here’s a conceptual example of how the vulnerability might be exploited:

POST /formSetQosBand HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
list=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA... [continue with 'A' characters until the buffer overflows]

In this example, the ‘A’ characters are sent as the list parameter in an amount that exceeds the buffer limit, leading to a potential buffer overflow.

Mitigation

Users are advised to apply the vendor patch for this vulnerability as soon as it becomes available. In the interim, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. These can be configured to detect and block attempts to exploit this vulnerability.