Overview
A new vulnerability, identified as CVE-2025-9443, has been discovered in Tenda CH22 1.0.0.1 that could potentially lead to system compromise or data leakage. This flaw affects the function formeditUserName of the file /goform/editUserName, and its exploitation could result in a buffer overflow. Given that the exploit has already been published, the vulnerability poses an immediate threat to all users of the affected versions of the product.
Vulnerability Summary
CVE ID: CVE-2025-9443
Severity: High (8.8 CVSS Score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Tenda | CH22 1.0.0.1
How the Exploit Works
The vulnerability is rooted in the function formeditUserName of the file /goform/editUserName. A user-supplied input is not properly validated for its length before it gets processed. This lack of input validation allows an attacker to submit a crafted request with an overly long ‘new_account’ argument value. This causes a buffer overflow, potentially leading to arbitrary code execution or system crashes.
Conceptual Example Code
This conceptual code snippet shows how an attacker might exploit the vulnerability. They would craft an HTTP POST request to the /goform/editUserName endpoint, with a ‘new_account’ field containing a malicious payload that triggers the buffer overflow.
POST /goform/editUserName HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "new_account": "A"*1024 }In this example, “A”*1024 represents an overly long string that exceeds the buffer capacity, leading to overflow. Be aware that this is a simplified representation and the actual exploitation would likely involve more sophisticated techniques to execute arbitrary code.
Mitigation Guidance
It is strongly recommended to apply the vendor’s patch as soon as it is available. If that is not immediately possible, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation. Regular monitoring and auditing of the affected systems are also advised to detect any unusual activity.
