Z-Wave devices based on Silicon Labs 500 series chipsets using S2, including but likely not limited to the ZooZ ZST10 version 6.04, ZooZ ZEN20 version 5.03, ZooZ ZEN25 version 5.03, Aeon Labs ZW090-A version 3.95, and Fibaro FGWPB-111 version 4.3, are susceptible to denial of service and resource exhaustion via malformed SECURITY NONCE GET, SECURITY NONCE GET 2, NO OPERATION, or NIF REQUEST messages.
CVSS v4.0 Metrics
Exploitability
Attack VectorAdjacent
ComplexityLow
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityNone
IntegrityNone
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | PoC | E: U→P | 2.3 → 5.4 |
| 2026-07-21 | nvd | AV: P→A, AC: H→L, PR: H→N, UI: A→N, VA: N→H | 0.0 → 2.3 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 0.0 |
Affected Software
| Vendor | Product | Version |
|---|
| Aeon Labs | ZW090-A | 3.95 |
| aeotec | zw090-a | 3.95 |
| fibaro | fgwpb-111 | 4.3 |
| Fibaro | FGWPB-111 | 4.3 |
| silabs | 500_series_firmware | All versions |
| Silicon Labs | 500 series | all |
| zooz | zen20 | 5.03 |
| ZooZ | ZEN20 | 5.03 |
| zooz | zen25 | 5.03 |
| ZooZ | ZEN25 | 5.03 |
| zooz | zst10 | 6.04 |
| ZooZ | ZST10 | 6.04 |
Published: 2022-01-07
