{"id":"CVE-2020-27633","details":"In FNET 4.6.3, TCP ISNs are improperly random.","modified":"2026-07-08T17:57:20.374148Z","published":"2023-10-10T17:15:10.607Z","references":[{"type":"ADVISORY","url":"https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01"},{"type":"ADVISORY","url":"https://www.forescout.com"},{"type":"ADVISORY","url":"https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/butok/fnet","events":[{"introduced":"fb3c86df5573af27e119f5c7dfc7aa5bd52475a2"},{"last_affected":"fb3c86df5573af27e119f5c7dfc7aa5bd52475a2"}],"database_specific":{"cpe":"cpe:2.3:a:butok:fnet:4.6.3:*:*:*:*:*:*:*","extracted_events":[{"introduced":"4.6.3"},{"last_affected":"4.6.3"}],"source":"CPE_STRING"}}],"versions":["4.6.3","v4.6.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-27633.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}