CVE-2025-1221: Silabs.com Zigbee

Medium severity, CVSS 5.9. EPSS: 0.2% chance of exploitation in the next 30 days.

A Zigbee Radio Co-Processor (RCP), which is using SiLabs EmberZNet Zigbee stack, was unable to send messages to the host system (CPCd) due to heavy Zigbee traffic, resulting in a Denial of Service (DoS) attack, Only hard reset will bring the device to normal operation

Affected products

• Silabs.com Zigbee: up to and including 4.3.3; version 4.4.3 only; up to and including 2024.6.1

Published 2025-07-30. Last modified 2026-06-17.