CVE-2002-0518

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2002-08-12 · updated 2026-06-16

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.

Affected products

FreeBSD: 4.5-release, 4.5-stable

References

http://www.iss.net/security_center/static/8873.php
http://www.iss.net/security_center/static/8875.php
http://www.osvdb.org/6046
http://www.securityfocus.com/bid/4524
http://www.iss.net/security_center/static/8873.php
http://www.iss.net/security_center/static/8875.php
http://www.osvdb.org/6046
http://www.securityfocus.com/bid/4524

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