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CVE-2025-46035: Buffer Overflow Vulnerability in Tenda AC6 v.15.03.05.16

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Overview

This report presents a detailed analysis of a significant security vulnerability, CVE-2025-46035, which affects Tenda AC6 v.15.03.05.16. The vulnerability is of high importance due to its potential to permit a remote attacker to cause a denial of service and possibly compromise the system or leak data.

Vulnerability Summary

CVE ID: CVE-2025-46035
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of service, potential system compromise, and data leakage

Affected Products

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Product | Affected Versions

Tenda AC6 | v.15.03.05.16

How the Exploit Works

This vulnerability stems from a buffer overflow issue in the handling of the schedStartTime and schedEndTime parameters in an unauthenticated HTTP GET request to the /goform/openSchedWifi endpoint in Tenda AC6 v.15.03.05.16. An attacker can send an oversized schedStartTime and schedEndTime parameters to this endpoint, which causes the system to overflow its buffer, leading to a denial of service. Depending on the system configuration, the attacker might also gain unauthorized access or cause data leakage.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. The malicious payload here consists of oversized schedStartTime and schedEndTime parameters.

GET /goform/openSchedWifi?schedStartTime=OVERSIZED_VALUE&schedEndTime=OVERSIZED_VALUE HTTP/1.1
Host: target.example.com

Note: Replace `OVERSIZED_VALUE` with values exceeding the expected size for the schedStartTime and schedEndTime parameters.

Mitigation Guidance

It is recommended to apply the vendor patch as soon as it is available to prevent potential attacks. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure.

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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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