VULNERABILITY INTELLIGENCE

CVE-2002-0518

CVSS score5 MEDIUM

EPSS probability2.47%

CISA KEVNot currently listed

Published2002-08-12

Last modified2026-06-16

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.