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Unrated severityNVD Advisory· Published Aug 12, 2002· Updated Jun 16, 2026

CVE-2002-0518

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.

Affected products

3
  • FreeBSD/FreeBSD3 versions
    cpe:2.3:o:freebsd:freebsd:4.5:release:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:freebsd:freebsd:4.5:release:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:4.5:stable:*:*:*:*:*:*
    • (no CPE)range: <=4.5

Patches

Vulnerability mechanics

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References

5

News mentions

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