{"id":"CVE-2002-0518","aliases":["EUVD-2002-0514","GHSA-9x25-pv9q-883c"],"status":"published","title":"The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows...","description":"The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for the socket's TCP options, or (2) by killing and restarting a process that listens on the same socket, which does not properly clear the old inpcb pointer on restart.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.02468,"percentile":0.84604,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2002-06-11T04:00:00Z","modified":"2026-06-16T21:57:35Z","products":[{"vendor":"freebsd","product":"freebsd"}],"references":[{"url":"ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc","tags":["vendor-advisory","x_refsource_FREEBSD","x_transferred"]},{"url":"http://www.osvdb.org/6046","tags":["vdb-entry","x_refsource_OSVDB","x_transferred"]},{"url":"http://www.iss.net/security_center/static/8873.php","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.iss.net/security_center/static/8875.php","tags":["vdb-entry","x_refsource_XF","x_transferred","Patch","Vendor Advisory"]},{"url":"http://www.securityfocus.com/bid/4524","tags":["vdb-entry","x_refsource_BID","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2002-0518"},{"url":"https://github.com/advisories/GHSA-9x25-pv9q-883c"}],"sources":{"cve":[{"id":"CVE-2002-0518","description":"The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for the socket's TCP options, or (2) by killing and restarting a process that listens on the same socket, which does not properly clear the old inpcb pointer on restart.","status":"published","published":"2002-06-11T04:00:00Z","modified":"2024-08-08T02:49:28.879Z","updated_at":"2026-11-02T14:33:55.642267Z"}],"euvd":[{"id":"EUVD-2002-0514","description":"The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for the socket's TCP options, or (2) by killing and restarting a process that listens on the same socket, which does not properly clear the old inpcb pointer on restart.","status":"published","published":"2002-06-11T04:00:00Z","modified":"2024-08-08T02:49:28Z","updated_at":"2026-11-03T01:15:00.542292Z"}],"ghsa":[{"id":"GHSA-9x25-pv9q-883c","title":"The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows...","description":"The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for the socket's TCP options, or (2) by killing and restarting a process that listens on the same socket, which does not properly clear the old inpcb pointer on restart.","status":"published","published":"2022-05-03T03:07:54Z","modified":"2023-02-01T05:01:03Z","updated_at":"2026-11-02T14:49:39.648637Z"}],"nvd":[{"id":"CVE-2002-0518","description":"The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for the socket's TCP options, or (2) by killing and restarting a process that listens on the same socket, which does not properly clear the old inpcb pointer on restart.","status":"published","published":"2002-08-12T04:00:00Z","modified":"2026-06-16T21:57:35.9Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:00:42.220505Z"}]}}