CVE-2025-1221

CVE-2025-1221 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-667.

Key facts

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

Frequently asked questions

What is CVE-2025-1221?
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
How severe is CVE-2025-1221?
CVE-2025-1221 has a CVSS 4.0 base score of 5.9, rated medium severity.
Is CVE-2025-1221 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-1221?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-1221 have an EU (EUVD) identifier?
Yes. CVE-2025-1221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23150.
When was CVE-2025-1221 published?
CVE-2025-1221 was published on 2025-07-30 and last updated on 2026-06-17.

References

Other CWE-667 (Improper Locking) vulnerabilities

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