In tcpdump 4.9.2, a stack-based buffer over-read exists in the print_prefix function of print-hncp.c via crafted packet data because of missing initialization.
https://usn.ubuntu.com/4252-2/
https://usn.ubuntu.com/4252-1/
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44516
https://github.com/zyingp/temp/blob/master/tcpdump.md