{"id":"CVE-2020-27631","details":"In Oryx CycloneTCP 1.9.6, TCP ISNs are improperly random.","modified":"2026-04-02T05:10:11.672001Z","published":"2023-10-10T17:15:10.453Z","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/oryx-embedded/cyclonetcp","events":[{"introduced":"0"},{"last_affected":"21fb9364b397deac4cb940c733e09cf34ec57b9c"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"1.9.6"}]}}],"versions":["v1.7.6","v1.7.8","v1.8.0","v1.8.2","v1.8.6","v1.9.0","v1.9.2","v1.9.4","v1.9.6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-27631.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:H"}]}