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CVE-2025-9297: Critical Buffer Overflow Vulnerability in Tenda i22 1.0.0.3(4687)

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Overview

A critical vulnerability has been identified in Tenda i22 1.0.0.3(4687), a widely used router. The vulnerability, tracked as CVE-2025-9297, affects the formWeixinAuthInfoGet function of the /goform/wxportalauth file. This flaw allows potential attackers to manipulate the ‘Type’ argument, leading to a stack-based buffer overflow. This can be exploited remotely and may result in a system compromise or data leakage, posing a significant risk to the confidentiality, integrity, and availability of user data and systems.

Vulnerability Summary

CVE ID: CVE-2025-9297
Severity: Critical, CVSS 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

Tenda i22 | 1.0.0.3(4687)

How the Exploit Works

The vulnerability stems from improper input validation in the formWeixinAuthInfoGet function. When processing an argument labeled ‘Type,’ the function fails to adequately check the size of the user-supplied data. This allows an attacker to provide an excessively long string, causing the program to overwrite the stack’s memory. This could allow an attacker to execute arbitrary code with the privileges of the affected service, leading to potential unauthorized access, information disclosure, or denial of service.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited using a maliciously crafted HTTP request:

POST /goform/wxportalauth HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
Type=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...[Long string of 'A's causing buffer overflow]

The above example demonstrates a buffer overflow attack, where the ‘Type’ parameter is supplied with a long string of ‘A’s, which exceeds the buffer’s limit, leading to the overflow.

Mitigation Guidance

The most effective mitigation for this vulnerability is to apply the vendor-supplied patch. Until the patch can be applied, it is recommended to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability. Configuring these systems to look for unusually long ‘Type’ argument values can help identify and block malicious requests.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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