CVE-2025-1221
MEDIUMSiLabs EmberZNet Zigbee <4.3.3, 4.4.3 - Denial of Service via Heavy Traffic
Title source: llmDescription
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
References (4)
Core 4
Core References
Various Sources release-notes
https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-7.4.4.0.pdf
Various Sources release-notes
https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-8.0.2.0.pdf
Various Sources release-notes
https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-8.1.0.0.pdf
Various Sources vendor-advisory
permissions-required
https://community.silabs.com/068Vm00000Sadyn
Scores
CVSS v4
5.9
EPSS
0.0017
EPSS Percentile
6.7%
CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-667
Status
published
Products (3)
silabs.com/Zigbee
< 2024.6.1
silabs.com/Zigbee
< 4.3.3
silabs.com/Zigbee
4.4.3
Published
Jul 30, 2025
Tracked Since
Feb 18, 2026