Description
The first S0 encryption key is generated with an uninitialized PRNG in Z/IP Gateway products running Silicon Labs Z/IP Gateway SDK v7.18.3 and earlier. This makes the first S0 key generated at startup predictable, potentially allowing network key prediction and unauthorized S0 network access.
References (2)
Core 2
Core References
Third Party Advisory
https://github.com/SiliconLabs/gecko_sdk
Permissions Required vendor-advisory
https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/0698Y00000buWj0QAE?operationContext=S1
Scores
CVSS v3
6.4
EPSS
0.0053
EPSS Percentile
40.1%
Attack Vector
PHYSICAL
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-1279
CWE-908
Status
published
Products (1)
silabs/z\/ip_gateway_sdk
< 7.18.03
Published
Dec 14, 2023
Tracked Since
Feb 18, 2026