{"id":"CVE-2020-27634","aliases":["EUVD-2020-20141","GHSA-pw9j-jvfg-9ppw"],"status":"published","title":"In Contiki 4.5, TCP ISNs are improperly random.","description":"In Contiki 4.5, TCP ISNs are improperly random.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01716,"percentile":0.77584,"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":"2026-06-17T03:09:24Z","products":[{"vendor":"contiki-ng","product":"contiki-ng"}],"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-2020-27634"},{"url":"https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks"},{"url":"https://github.com/advisories/GHSA-pw9j-jvfg-9ppw"}],"sources":{"cve":[{"id":"CVE-2020-27634","description":"In Contiki 4.5, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T00:00:00Z","modified":"2024-09-19T15:04:22.313Z","updated_at":"2026-11-02T14:35:53.552996Z"}],"euvd":[{"id":"EUVD-2020-20141","description":"In Contiki 4.5, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T00:00:00Z","modified":"2024-09-19T15:04:22Z","updated_at":"2026-11-03T00:28:19.06347Z"}],"ghsa":[{"id":"GHSA-pw9j-jvfg-9ppw","title":"In Contiki 4.5, TCP ISNs are improperly random.","description":"In Contiki 4.5, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T18:31:32Z","modified":"2024-04-11T21:08:50Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T14:57:07.421443Z"}],"nvd":[{"id":"CVE-2020-27634","description":"In Contiki 4.5, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T17:15:10.657Z","modified":"2026-06-17T03:09:24.26Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"primary"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T14:06:47.910346Z"}]}}