{"cve":"CVE-2020-27633","nvd":{"published":"2023-10-10T17:15:10.607","modified":"2026-06-17T03:09:24.127","status":"Modified","description":"In FNET 4.6.3, TCP ISNs are improperly random.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-330"],"references":["https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01","https://www.forescout.com","https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/","https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01","https://www.forescout.com"],"products":["butok:fnet"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2020-27633","score":0.00871,"percentile":0.58862,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}