CVE-2021-3320: Zephyrproject Zephyr

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

Type Confusion in 802154 ACK Frames Handling. Zephyr versions >= v2.4.0 contain NULL Pointer Dereference (CWE-476). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-27r3-rxch-2hm7

Affected products

• Zephyrproject Zephyr: from 2.0.0, up to and including 2.4.0

Published 2021-05-25. Last modified 2026-06-17.