CVE-2025-9006: Critical Remote Buffer Overflow Vulnerability in Tenda CH22 1.0.0.1

Overview

The cybersecurity landscape has witnessed yet another critical vulnerability – CVE-2025-9006 – that is affecting the Tenda CH22 1.0.0.1. This vulnerability is significant due to its potential for remote exploitation, leading to potential system compromise or data leakage. Primarily concerning the function formdelFileName of the file /goform/delFileName, this vulnerability is of high severity based on its CVSS score of 8.8. In this post, we will dive deep into the technical aspects of this vulnerability, its potential impact, and how to mitigate it.

Vulnerability Summary

CVE ID: CVE-2025-9006
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

Product | Affected Versions

Tenda CH22 | 1.0.0.1

How the Exploit Works

This exploit targets the function formdelFileName of the file /goform/delFileName in Tenda CH22 1.0.0.1. The vulnerability arises from improper handling of input data, leading to buffer overflow. An attacker can craft a malicious payload in such a way that it overflows the buffer, corrupts the memory, and leads to unexpected behaviors, including potential remote code execution or system crashes. This vulnerability can be exploited remotely without requiring any user interactions or privileges.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. This example illustrates a HTTP POST request with a malicious payload that could potentially cause a buffer overflow:

POST /goform/delFileName HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"filename": "AAAAAAAAAAAAA...[continue till buffer overflow]..."
}

In the above example, the filename is filled with a large amount of data (‘A’s), causing a buffer overflow in the formdelFileName function.

Mitigation

To mitigate the risk posed by this vulnerability, Tenda users should apply the latest vendor-provided patches immediately. If the patch is not available, users may use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. These solutions can help identify and block malicious activity associated with exploiting this vulnerability. However, they should not be considered as a permanent fix.