{"id":"CVE-2023-4489","state":"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.","publishedAt":"2023-12-14T23:00:29.693Z","updatedAt":"2025-05-21T14:29:37.355Z","severity":{"score":6.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Silabs"},"assigner":"Silabs","products":["silabs.com Z/IP Gateway SDK"],"affected":[{"vendor":"silabs.com","product":"Z/IP Gateway SDK","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"7.18.3","versionType":"LessThan"}]}],"references":["https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/0698Y00000buWj0QAE?operationContext=S1","https://github.com/SiliconLabs/gecko_sdk"],"weaknesses":["CWE-1279"],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/4xxx/CVE-2023-4489.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-4489","state":"PUBLISHED","datePublished":"2023-12-14T23:00:29.693Z","dateUpdated":"2025-05-21T14:29:37.355Z","assignerShortName":"Silabs","assignerOrgId":"030b2754-1501-44a4-bef8-48be86a33bf4","dateReserved":"2023-08-23T04:17:01.960Z"},"containers":{"cna":{"title":"Z/IP Gateway Use of Uninitialized PRNG when Generating S0 Encryption Key","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"silabs.com","product":"Z/IP Gateway SDK","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"7.18.3","versionType":"LessThan"}]}],"references":[{"url":"https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/0698Y00000buWj0QAE?operationContext=S1","tags":["vendor-advisory"]},{"url":"https://github.com/SiliconLabs/gecko_sdk"}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"PHYSICAL","availabilityImpact":"HIGH","baseScore":6.4,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1279","description":"CWE-1279 Cryptographic Operations are run Before Supporting Units are Ready","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"Silabs","orgId":"030b2754-1501-44a4-bef8-48be86a33bf4","dateUpdated":"2024-09-27T16:22:41.599Z"},"impacts":[{"capecId":"CAPEC-59","descriptions":[{"lang":"en","value":"CAPEC-59 Session Credential Falsification through Prediction"}]}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.1.0-dev"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/0698Y00000buWj0QAE?operationContext=S1","tags":["vendor-advisory","x_transferred"]},{"url":"https://github.com/SiliconLabs/gecko_sdk","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T07:31:05.899Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-05-21T14:28:57.358361Z","id":"CVE-2023-4489","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-05-21T14:29:37.355Z"}}]}}}