{"id":"CVE-2023-4489","aliases":["EUVD-2023-54344","GHSA-6jw3-xmj9-qvcw"],"status":"published","title":"Z/IP Gateway Use of Uninitialized PRNG when Generating S0 Encryption Key","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.","severity":{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00525,"percentile":0.44775,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1279","CWE-908"],"published":"2023-12-14T23:00:29Z","modified":"2026-06-17T06:37:56Z","products":[{"vendor":"silabs","product":"z\\/ip_gateway_sdk"},{"vendor":"silabs.com","product":"z/ip gateway sdk"}],"references":[{"url":"https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/0698Y00000buWj0QAE?operationContext=S1","tags":["vendor-advisory","x_transferred","Permissions Required"]},{"url":"https://github.com/SiliconLabs/gecko_sdk","tags":["x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4489"},{"url":"https://github.com/advisories/GHSA-6jw3-xmj9-qvcw"}],"sources":{"cve":[{"id":"CVE-2023-4489","title":"Z/IP Gateway Use of Uninitialized PRNG when Generating S0 Encryption Key","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.","status":"published","published":"2023-12-14T23:00:29.693Z","modified":"2025-05-21T14:29:37.355Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-1279"],"updated_at":"2026-11-02T14:35:30.474787Z"}],"euvd":[{"id":"EUVD-2023-54344","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.","status":"published","published":"2023-12-14T23:00:29Z","modified":"2025-05-21T14:29:37Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T20:32:41.46277Z"}],"ghsa":[{"id":"GHSA-6jw3-xmj9-qvcw","title":"\n\n\nThe first S0 encryption key is generated with an uninitialized PRNG in Z/IP Gateway products...","description":"\n\n\nThe 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.\n\n \n\n","status":"published","published":"2023-12-15T00:31:03Z","modified":"2024-09-27T18:32:21Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"cwes":["CWE-908","CWE-1279"],"updated_at":"2026-11-02T14:58:21.889894Z"}],"nvd":[{"id":"CVE-2023-4489","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.","status":"published","published":"2023-12-14T23:15:07.4Z","modified":"2026-06-17T06:37:56.49Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-1279","CWE-908"],"updated_at":"2026-11-02T14:08:54.696438Z"}]}}