CVE:CVE-2001-0402
CNNVD:CNNVD-200106-083
IPFilter 3.4.16版本及之前版本在其缓存中不包括充分的会话信息，远程攻击者可以通过在发送未成碎片数据包到不受限端口之后发送碎片数据包到受限端口来绕过访问限制。
solution:Upgrade darren_reed ipfilter to a higher version than 3.4.16,and avoid the version (,3.4.16]; Upgrade freebsd freebsd to a higher version than 4.1,and avoid the version (,4.1]; Upgrade openbsd openbsd to a higher version than 2.8,and avoid the version 2.8