CVE-2002-0518

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.

• ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc
• http://www.iss.net/security_center/static/8873.php
• http://www.iss.net/security_center/static/8875.phpPatch, Vendor Advisory
• http://www.osvdb.org/6046
• http://www.securityfocus.com/bid/4524Patch, Vendor Advisory
• ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc
• http://www.iss.net/security_center/static/8873.php
• http://www.iss.net/security_center/static/8875.phpPatch, Vendor Advisory
• http://www.osvdb.org/6046
• http://www.securityfocus.com/bid/4524Patch, Vendor Advisory

Published

Aug 12, 2002

Last Modified

Jun 16, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2002-0512startkde in KDE for Caldera OpenLinux 2.3 through 3.1.1 sets…
• CVE-2002-0513The PHP administration script in popper_mod 1.2.1 and earlie…
• CVE-2002-0514PF in OpenBSD 3.0 with the return-rst rule sets the TTL to 1…
• CVE-2002-0515IPFilter 3.4.25 and earlier sets a different TTL when a port…
• CVE-2002-0516SquirrelMail 1.2.5 and earlier allows authenticated Squirrel…
• CVE-2002-0517Buffer overflow in X11 library (libX11) on Caldera Open UNIX…
• CVE-2002-0520Cross-site scripting vulnerability in functions-inc.asp for …
• CVE-2002-0521Cross-site scripting vulnerabilities in ASP-Nuke RC2 and ear…
• CVE-2002-0522ASP-Nuke RC2 and earlier allows remote attackers to bypass a…
• CVE-2002-0523ASP-Nuke RC2 and earlier allows remote attackers to list all…
• CVE-2002-0524ASP-Nuke RC2 and earlier allows remote attackers to determin…
• CVE-2002-0525Format string vulnerabilities in (1) inews or (2) rnews for …