CVE-2002-0518: Freebsd

Medium severity, CVSS 5.0. EPSS: 2.5% chance of exploitation in the next 30 days.

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.

Affected products

Published 2002-08-12. Last modified 2026-06-16.