CVE-2021-3861 Explained : Impact and Mitigation

A detailed guide on CVE-2021-3861, highlighting the vulnerability, impact, technical details, and mitigation steps.

Understanding CVE-2021-3861

This section provides an overview of the CVE-2021-3861 vulnerability affecting Zephyr.

What is CVE-2021-3861?

The RNDIS USB device class is vulnerable to a buffer overflow flaw in Zephyr versions >= v2.6.0, leading to a Heap-based Buffer Overflow (CWE-122).

The Impact of CVE-2021-3861

The vulnerability has a high severity impact with a CVSS base score of 8.2. It can result in compromised integrity and availability of affected systems.

Technical Details of CVE-2021-3861

Explore the specific technical aspects of CVE-2021-3861.

Vulnerability Description

The vulnerability arises due to a heap-based buffer overflow within the RNDIS USB device class implementation.

Affected Systems and Versions

Zephyr versions >= v2.6.0 are impacted by this vulnerability, potentially exposing systems to exploitation.

Exploitation Mechanism

The vulnerability can be exploited by an adjacent network attacker, requiring no user interaction and no privileges.

Mitigation and Prevention

Discover the steps to mitigate the CVE-2021-3861 vulnerability and enhance system security.

Immediate Steps to Take

Immediately update Zephyr to a secure version and apply patches to fix the buffer overflow vulnerability.

Long-Term Security Practices

Implement secure coding practices, conduct regular security audits, and stay informed about potential vulnerabilities.

Patching and Updates

Regularly monitor for security advisories from Zephyr and apply patches promptly to address known vulnerabilities.