{"id":"CVE-2020-27630","aliases":["EUVD-2020-20137","GHSA-g82m-q2g7-55jc"],"status":"published","title":"In Silicon Labs uC/TCP-IP 3.6.0, TCP ISNs are improperly random.","description":"In Silicon Labs uC/TCP-IP 3.6.0, TCP ISNs are improperly random.","severity":{"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","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01083,"percentile":0.6548,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-330"],"published":"2023-10-10T00:00:00Z","modified":"2026-06-17T03:09:23Z","products":[{"vendor":"silabs","product":"uc\\/tcp-ip"}],"references":[{"url":"https://www.forescout.com","tags":["x_transferred","Third Party Advisory"]},{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01","tags":["x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/","tags":["x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27630"},{"url":"https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks"},{"url":"https://github.com/advisories/GHSA-g82m-q2g7-55jc"}],"sources":{"cve":[{"id":"CVE-2020-27630","description":"In Silicon Labs uC/TCP-IP 3.6.0, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T00:00:00Z","modified":"2024-09-19T15:29:41.791Z","updated_at":"2026-11-02T14:35:53.552996Z"}],"euvd":[{"id":"EUVD-2020-20137","description":"In Silicon Labs uC/TCP-IP 3.6.0, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T00:00:00Z","modified":"2024-09-19T15:29:41Z","updated_at":"2026-11-03T00:28:19.06347Z"}],"ghsa":[{"id":"GHSA-g82m-q2g7-55jc","title":"In Silicon Labs uC/TCP-IP 3.6.0, TCP ISNs are improperly random.","description":"In Silicon Labs uC/TCP-IP 3.6.0, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T18:31:32Z","modified":"2024-04-04T08:29:53Z","cvss":[{"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"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T14:56:59.092045Z"}],"nvd":[{"id":"CVE-2020-27630","description":"In Silicon Labs uC/TCP-IP 3.6.0, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T17:15:10.403Z","modified":"2026-06-17T03:09:23.747Z","cvss":[{"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-330"],"updated_at":"2026-11-02T14:06:47.910346Z"}]}}