CVE:CVE-2002-0381
CNNVD:CNNVD-200206-069
多个BSD操作系统的TCP/IP实现存在错误，包括FreeBSD和NetBSD，OpenBSD可能也有此问题。
RFC 1122定义的TCP实现对于进入的SYN分段的地址是去向多播或广播地址的必需丢弃不作任何反应。受影响的BSD在实现上是基于链路层地址丢弃包而不是检查目标IP地址。
solution:Upgrade freebsd freebsd to a higher version than 4.5,and avoid the version (,4.5]; Upgrade netbsd netbsd to a higher version than 2.0.4,and avoid the version 2.0.4; Upgrade openbsd openbsd to a higher version than *