Medium severity · published Jul 30, 2025
CVE-2025-1221
DoS in Zigbee device due to heavy traffic
5.9
CVSS
0.2%
EPSS
No
On KEV
Description
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
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZI
Zigbee · silabs.com
through 4.3.3; 4.4.3; through 2024.6.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-1221
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-1221
community.silabs.com
https://community.silabs.com/068Vm00000Sadyn
www.silabs.com
https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-7.4.4.0.pdf
www.silabs.com
https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-8.0.2.0.pdf
www.silabs.com
https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-8.1.0.0.pdf