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.

Niels Provos libevent 1.2 and 1.2a allows remote attackers to cause a denial of service (infinite loop) via a DNS response containing a label pointer that references its own offset.

Niels Provos Systrace 1.6f and earlier on the x86_64 Linux platform allows local users to bypass intended access restrictions by making a 32-bit syscall with a syscall number that corresponds to a policy-compliant 64-bit syscall, related to race conditions that occur in monitoring 64-bit processes.