CVE-2021-3320 : What You Need to Know

A detailed overview of CVE-2021-3320, a vulnerability in Zephyr affecting versions above v2.4.0.

Understanding CVE-2021-3320

This CVE involves a type confusion issue in the handling of 802154 ACK frames in Zephyr, leading to a NULL Pointer Dereference (CWE-476) vulnerability.

What is CVE-2021-3320?

The CVE-2021-3320 vulnerability in Zephyr versions >= v2.4.0 involves a type confusion in 802154 ACK Frames Handling, resulting in a NULL Pointer Dereference (CWE-476).

The Impact of CVE-2021-3320

With a CVSS base score of 5.9 (Medium severity), the vulnerability could be exploited remotely with high availability impact. It requires no user interaction or privileges.

Technical Details of CVE-2021-3320

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability is caused by a type confusion issue in the handling of 802154 ACK frames, leading to a NULL Pointer Dereference (CWE-476).

Affected Systems and Versions

Zephyr versions >= v2.4.0 are affected by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited remotely with high availability impact, requiring no user interaction or privileges.

Mitigation and Prevention

Discover the steps to mitigate and prevent the CVE-2021-3320 vulnerability in Zephyr.

Immediate Steps to Take

It is recommended to update Zephyr to a secure version, apply patches, and monitor for any suspicious activity.

Long-Term Security Practices

Adopt secure coding practices, conduct regular security audits, and stay informed about security advisories.

Patching and Updates

Keep Zephyr up to date with the latest security patches and releases to mitigate the risk of exploitation.