CVE-2021-3835 : What You Need to Know

This article discusses CVE-2021-3835, a Buffer overflow vulnerability in the USB device class in Zephyr versions >= v2.6.0, leading to a Heap-based Buffer Overflow (CWE-122).

Understanding CVE-2021-3835

CVE-2021-3835 is a high-severity vulnerability affecting Zephyr versions >= v2.6.0, with a CVSS base score of 8.2.

What is CVE-2021-3835?

The CVE-2021-3835 vulnerability is a buffer overflow issue within the USB device class in Zephyr, potentially allowing attackers to execute arbitrary code or crash the application.

The Impact of CVE-2021-3835

This vulnerability has a high impact on availability and integrity, with low impact on confidentiality. Attackers with adjacent network access can exploit this flaw without requiring any special privileges.

Technical Details of CVE-2021-3835

This section covers specific technical details regarding the vulnerability.

Vulnerability Description

The vulnerability arises from a buffer overflow in the USB device class in Zephyr, affecting versions greater than or equal to v2.6.0.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers can exploit this vulnerability through a heap-based buffer overflow, designated as CWE-122.

Mitigation and Prevention

To address CVE-2021-3835, immediate steps and long-term security practices are crucial.

Immediate Steps to Take

Update Zephyr to a patched version that addresses the buffer overflow issue.
Monitor network traffic for any suspicious activity that may indicate an attack.

Long-Term Security Practices

Regularly update and patch software to eliminate known vulnerabilities.
Implement network segmentation and access controls to restrict unauthorized access.

Patching and Updates

Stay informed about security advisories and regularly check for updates from Zephyr to ensure your systems are protected against CVE-2021-3835.