Critical severity · published Dec 14, 2023
CVE-2023-4489
Z/IP Gateway Use of Uninitialized PRNG when Generating S0 Encryption Key
9.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZG
Z/IP Gateway SDK · silabs.com
through 7.18.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-4489
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-4489
Third Party Advisory
https://github.com/SiliconLabs/gecko_sdk
Permissions Required
https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/0698Y00000buWj0QAE?operationContext=S1
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