CVE-2025-7417: Critical Vulnerability in Tenda O3V2 Leads to Stack-Based Buffer Overflow

Overview

The cybersecurity world has recently turned its attention to a critical vulnerability found in Tenda O3V2 1.0.0.12(3880). This vulnerability, identified as CVE-2025-7417, has been classified as critical due to its potential to compromise systems or leak sensitive data. This vulnerability is not limited to local networks, but can be exploited remotely, making it a significant threat to any unpatched systems.
The severity of this vulnerability is intensified by the fact that it is now publicly known. As such, malicious entities armed with this knowledge can exploit the vulnerability if not addressed promptly. It is therefore crucial for all users and administrators of Tenda O3V2 1.0.0.12(3880) to understand the vulnerabilities, its implications, and the steps to mitigate it.

Vulnerability Summary

CVE ID: CVE-2025-7417
Severity: Critical (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

Tenda O3V2 | 1.0.0.12(3880)

How the Exploit Works

The vulnerability resides in the function fromNetToolGet of the file /goform/setPingInfo, part of the httpd component. The flaw is a stack-based buffer overflow that can be triggered by manipulating the ‘ip’ argument.
When the ‘ip’ argument is manipulated with a specially crafted input, it overflows the buffer, thereby corrupting adjacent memory locations. This could potentially lead to the execution of arbitrary code or cause the application to crash, leading to a denial of service.

Conceptual Example Code

Here is a conceptual example of how a malicious HTTP request might look, exploiting the buffer overflow vulnerability.

POST /goform/setPingInfo HTTP/1.1
Host: targetIP
Content-Type: application/x-www-form-urlencoded
Content-Length: Length
ip=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA... (continues to overflow buffer)

This HTTP request is sending an excessively long ‘ip’ argument to the setPingInfo function, causing a buffer overflow. This is a conceptual example and actual exploitation would require specific knowledge of the system’s memory structure and potential payload to execute.

Mitigation

It is recommended to apply vendor-supplied patches as soon as they are available. In the absence of such patches or if application is delayed, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. These systems should be configured to detect and block abnormal ‘ip’ arguments to the /goform/setPingInfo endpoint.