Niels Provos Honeyd before 1.5 replies to certain illegal IP packet fragments that other IP stack implementations would drop, which allows remote attackers to identify IP addresses that are being simulated using honeyd.
Exploitability
AV:NAC:LAu:NImpact
C:PI:NA:N5/AV:N/AC:L/Au:N/C:P/I:N/A:N