PT-2025-31377 · Silicon · Ember Znet

CVE-2025-1221 · Published 2025-07-30 · Updated 2025-07-30

Positive Technologies (AI Summary)

CVSS v4.0

5.9

Medium

Base vector

AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions SiLabs EmberZNet Zigbee stack (affected versions not specified)

Description A Zigbee Radio Co-Processor (RCP) using the SiLabs EmberZNet Zigbee stack was unable to send messages to the host system (CPCd) due to heavy Zigbee traffic. This resulted in a Denial of Service (DoS) attack, requiring a hard reset to restore normal device operation.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Improper Locking

Weakness Enumeration

CWE-667

Related Identifiers

CVE-2025-1221

Affected Products

Ember Znet

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/1xxx/CVE-2025-1221.json · Exploit
• https://community.silabs.com/068Vm00000Sadyn · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-1221 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-1221 · Security Note
• https://github.com/SiliconLabs/gecko_sdk · Note
• https://github.com/SiliconLabs/simplicity_sdk · Note
• https://silabs.com/documents/public/release-notes/emberznet-release-notes-8.0.2.0.pdf · Note
• https://t.me/CVEtracker/28736 · Telegram Post
• https://twitter.com/CVEnew/status/1950479860284928412 · Twitter Post
• https://silabs.com/documents/public/release-notes/emberznet-release-notes-8.1.0.0.pdf · Note
• https://silabs.com/documents/public/release-notes/emberznet-release-notes-7.4.4.0.pdf · Note