Z/IP Gateway Use of Uninitialized PRNG when Generating S0 Encryption Key
Priority MEDIUM 43CWE-1279Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00525 44th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| silabs.com | Z/IP Gateway SDK | up to 7.18.3 | — | No fix listed | CNA |
- Z/IP Gateway SDK Vendorsilabs.com Affected up to 7.18.3 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:silabs:z\/ip_gateway_sdk:*:*:*:*:*:*:*:* | up to 7.18.03 | Vulnerable | silabs.com |
- cpe:2.3:a:silabs:z\/ip_gateway_sdk:*:*:*:*:*:*:*:* Versions up to 7.18.03 Vulnerable ·silabs.com
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-4489
- 2026-10-03 Alias added: GHSA-6jw3-xmj9-qvcw
References
More silabs.com Z/ip Gateway Sdk vulnerabilities
- TI-2023-00923 Buffer overflow in S0 Decryption on Z/IP Gatweay CVSS 3.1CRITICAL 9.6
- TI-2023-00922 Command Authentication Bypass in Z/IP Gateway CVSS 3.1CRITICAL 9.6
- TI-2023-00921 Serial API Buffer Overflow in Z/IP Gateway CVSS 3.1HIGH 7.1
- TI-2023-00920 Global read overflow in Z/IP Gateway CVSS 3.1LOW 3.5
Sources
- CVE-2023-4489 · CVE Program
- CVE-2023-4489 · NVD
- FIRST EPSS
- GHSA-6jw3-xmj9-qvcw · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences