Honeyd before 0.8 replies to TCP packets with the SYN and RST flags set, which allows remote attackers to identify IP addresses that are being simulated by Honeyd.

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.

Unspecified vulnerability in Niels Provos Honeyd before 1.5b allows remote attackers to cause a denial of service (application crash) via certain Address Resolution Protocol (ARP) packets.