{"id":"CVE-2003-1230","aliases":["EUVD-2003-1220","GHSA-7hx3-c6gv-rvgg"],"status":"published","title":"The implementation of SYN cookies (syncookies) in FreeBSD 4.5 through 5.0-RELEASE-p3 uses only 32...","description":"The implementation of SYN cookies (syncookies) in FreeBSD 4.5 through 5.0-RELEASE-p3 uses only 32-bit internal keys when generating syncookies, which makes it easier for remote attackers to conduct brute force ISN guessing attacks and spoof legitimate traffic.","severity":{"version":"2.0","score":6.4,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01351,"percentile":0.71705,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2003-12-31T05:00:00Z","modified":"2026-06-16T22:03:45Z","references":[{"url":"http://www.osvdb.org/19785","tags":["vdb-entry","x_refsource_OSVDB","x_transferred"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/11397","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.securityfocus.com/bid/6920","tags":["vdb-entry","x_refsource_BID","x_transferred","Patch"]},{"url":"http://secunia.com/advisories/8142/","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory"]},{"url":"http://www.securityfocus.com/advisories/5013","tags":["vendor-advisory","x_refsource_FREEBSD","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2003-1230"},{"url":"http://secunia.com/advisories/8142"},{"url":"https://github.com/advisories/GHSA-7hx3-c6gv-rvgg"}],"sources":{"cve":[{"id":"CVE-2003-1230","description":"The implementation of SYN cookies (syncookies) in FreeBSD 4.5 through 5.0-RELEASE-p3 uses only 32-bit internal keys when generating syncookies, which makes it easier for remote attackers to conduct brute force ISN guessing attacks and spoof legitimate traffic.","status":"published","published":"2005-08-17T04:00:00Z","modified":"2024-08-08T02:19:45.987Z","updated_at":"2026-11-02T14:20:16.411288Z"}],"euvd":[{"id":"EUVD-2003-1220","description":"The implementation of SYN cookies (syncookies) in FreeBSD 4.5 through 5.0-RELEASE-p3 uses only 32-bit internal keys when generating syncookies, which makes it easier for remote attackers to conduct brute force ISN guessing attacks and spoof legitimate traffic.","status":"published","published":"2005-08-17T04:00:00Z","modified":"2024-08-08T02:19:45Z","updated_at":"2026-11-03T01:15:04.43595Z"}],"ghsa":[{"id":"GHSA-7hx3-c6gv-rvgg","title":"The implementation of SYN cookies (syncookies) in FreeBSD 4.5 through 5.0-RELEASE-p3 uses only 32...","description":"The implementation of SYN cookies (syncookies) in FreeBSD 4.5 through 5.0-RELEASE-p3 uses only 32-bit internal keys when generating syncookies, which makes it easier for remote attackers to conduct brute force ISN guessing attacks and spoof legitimate traffic.","status":"published","published":"2022-04-29T01:27:43Z","modified":"2025-04-03T03:56:37Z","updated_at":"2026-11-02T15:00:38.47838Z"}],"nvd":[{"id":"CVE-2003-1230","description":"The implementation of SYN cookies (syncookies) in FreeBSD 4.5 through 5.0-RELEASE-p3 uses only 32-bit internal keys when generating syncookies, which makes it easier for remote attackers to conduct brute force ISN guessing attacks and spoof legitimate traffic.","status":"published","published":"2003-12-31T05:00:00Z","modified":"2026-06-16T22:03:45.727Z","cvss":[{"version":"2.0","score":6.4,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:00:48.212104Z"}]}}