CVE-2022-40866 Explained : Impact and Mitigation

Tenda W20E router V15.11.0.6 (US_W20EV4.0br_V15.11.0.6(1068_1546_841)_CN_TDC) contains a stack overflow vulnerability in the function formSetDebugCfg with request /goform/setDebugCfg/.

Understanding CVE-2022-40866

This CVE identifies a stack overflow vulnerability in the Tenda W20E router.

What is CVE-2022-40866?

The CVE-2022-40866 is a stack overflow vulnerability found in the function formSetDebugCfg of the Tenda W20E router, version V15.11.0.6. This vulnerability can be exploited by sending a malicious request to the /goform/setDebugCfg/ endpoint.

The Impact of CVE-2022-40866

This vulnerability could allow an attacker to execute arbitrary code, leading to a potential system compromise or unauthorized access to sensitive information on the affected router.

Technical Details of CVE-2022-40866

Vulnerability Description

The vulnerability exists due to improper handling of user-supplied input in the affected function, leading to a stack overflow condition.

Affected Systems and Versions

The vulnerability affects Tenda W20E router with version V15.11.0.6 (US_W20EV4.0br_V15.11.0.6(1068_1546_841)_CN_TDC).

Exploitation Mechanism

An attacker can exploit this vulnerability by sending a specially crafted request to the /goform/setDebugCfg/ endpoint, causing a stack overflow and potentially executing malicious code.

Mitigation and Prevention

Immediate Steps to Take

It is recommended to apply security patches provided by Tenda to mitigate this vulnerability. Disable remote access to the router unless necessary and monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update the router firmware to the latest version and follow cybersecurity best practices to enhance the overall security posture of your network.

Patching and Updates

Stay informed about security updates released by Tenda for the W20E router and apply patches promptly to protect against known vulnerabilities.