CVE-2025-1221 json
DoS in Zigbee device due to heavy traffic
published 2025-07-30 15 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-23150
- cvss
- 5.9
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 11%
- public exploits
- 0
- none known
Summary
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
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 15 mo ago
Exploit prediction
0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- silabs.com Zigbee
Classification
- Weakness
-
- CWE-667 Improper Locking
References
-
community.silabs.com
/068Vm00000Sadyn
vendor-advisory, permissions-required
-
silabs.com
/documents/public/release-notes/emberznet-release-notes-7.4.4.0.pdf
release-notes
-
silabs.com
/documents/public/release-notes/emberznet-release-notes-8.0.2.0.pdf
release-notes
-
silabs.com
/documents/public/release-notes/emberznet-release-notes-8.1.0.0.pdf
release-notes
Sources
- CVE List CVE-2025-1221
- NVD CVE-2025-1221
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.