# CVE-2025-1221

## Summary

- **CVE ID:** CVE-2025-1221
- **Severity:** MEDIUM
- **CVSS Score:** 5.9 (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)
- **CWE:** CWE-667
- **Published:** Jul 30, 2025
- **Last Modified:** Mar 13, 2026

## 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

## Affected Products

- silabs.com — Zigbee (0)
- silabs.com — Zigbee (4.4.3)

## References

- [CNA](https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-7.4.4.0.pdf)
- [CNA](https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-8.0.2.0.pdf)
- [CNA](https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-8.1.0.0.pdf)
- [CNA](https://community.silabs.com/068Vm00000Sadyn)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 7.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._