{"id":"CVE-2020-27633","aliases":["EUVD-2020-20140","GHSA-5m6v-343g-pr27"],"status":"published","title":"In FNET 4.6.3, TCP ISNs are improperly random.","description":"In FNET 4.6.3, 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":0.00871,"percentile":0.59108,"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":"2026-10-24T10:30:30Z","products":[{"vendor":"butok","product":"fnet"}],"references":[{"url":"https://www.forescout.com","tags":["x_transferred","Third Party Advisory","advisory"]},{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01","tags":["x_transferred","Third Party Advisory","US Government Resource","advisory"]},{"url":"https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/","tags":["x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27633"},{"url":"https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks"},{"url":"https://github.com/advisories/GHSA-5m6v-343g-pr27"}],"sources":{"cve":[{"id":"CVE-2020-27633","description":"In FNET 4.6.3, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T00:00:00Z","modified":"2024-09-19T15:10:06.481Z","updated_at":"2026-11-02T14:35:53.552996Z"}],"euvd":[{"id":"EUVD-2020-20140","description":"In FNET 4.6.3, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T00:00:00Z","modified":"2024-09-19T15:10:06Z","updated_at":"2026-11-03T00:28:19.06347Z"}],"ghsa":[{"id":"GHSA-5m6v-343g-pr27","title":"In FNET 4.6.3, TCP ISNs are improperly random.","description":"In FNET 4.6.3, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T18:31:32Z","modified":"2024-04-04T08:29:56Z","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":"2026-11-02T14:56:59.092045Z"}],"nvd":[{"id":"CVE-2020-27633","description":"In FNET 4.6.3, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T17:15:10.607Z","modified":"2026-06-17T03:09:24.127Z","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"}],"osv":[{"id":"CVE-2020-27633","description":"In FNET 4.6.3, TCP ISNs are improperly random.","status":"published","published":"2023-10-10T17:15:10.607Z","modified":"2026-10-24T10:30:30.546270185Z","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"}],"updated_at":"2026-11-02T15:44:16.248747Z"}]}}