CVE-2021-4070 : What You Need to Know

An in-depth analysis of the CVE-2021-4070 vulnerability in v2fly/v2ray-core, including its impact, technical details, and mitigation strategies.

Understanding CVE-2021-4070

This section explores the details of the Off-by-one Error in v2fly/v2ray-core.

What is CVE-2021-4070?

The CVE-2021-4070 vulnerability is described as an Off-by-one Error in the GitHub repository v2fly/v2ray-core prior to 4.44.0.

The Impact of CVE-2021-4070

With a CVSS base score of 5.9, this vulnerability has a medium severity level. It can be exploited locally, affecting confidentiality, integrity, and availability to some extent.

Technical Details of CVE-2021-4070

This section dives into the technical aspects of the CVE-2021-4070 vulnerability.

Vulnerability Description

The Off-by-one Error allows attackers to manipulate data beyond the bounds of an array, potentially leading to unauthorized access or denial of service.

Affected Systems and Versions

The vulnerability impacts v2fly/v2ray-core versions prior to 4.44.0.

Exploitation Mechanism

Attackers can exploit this vulnerability locally with no special privileges required, compromising the integrity of the system.

Mitigation and Prevention

Discover the steps to mitigate the risks associated with CVE-2021-4070.

Immediate Steps to Take

Users are advised to update v2fly/v2ray-core to version 4.44.0 or newer to prevent exploitation of this vulnerability.

Long-Term Security Practices

Implement secure coding practices, conduct regular security audits, and stay informed about potential threats to enhance overall security.

Patching and Updates

Regularly apply security patches and updates provided by v2fly to address newly identified vulnerabilities.