rpcapd/daemon.c in libpcap before 1.9.1 mishandles certain length values because of reuse of a variable. This may open up an attack vector involving extra data at the end of a request.
https://www.tcpdump.org/public-cve-list.txt
https://www.oracle.com/security-alerts/cpuapr2020.html
https://support.apple.com/kb/HT210790
https://support.apple.com/kb/HT210789
https://support.apple.com/kb/HT210788
https://support.apple.com/kb/HT210785
https://seclists.org/bugtraq/2019/Dec/23
https://github.com/the-tcpdump-group/libpcap/commit/617b12c0339db4891d117b661982126c495439ea
https://github.com/the-tcpdump-group/libpcap/blob/libpcap-1.9/CHANGES