rpcapd/daemon.c in libpcap before 1.9.1 on non-Windows platforms provides details about why authentication failed, which might make it easier for attackers to enumerate valid usernames.
seclists.org/fulldisclosure/2019/Dec/26
github.com/the-tcpdump-group/libpcap/blob/libpcap-1.9/CHANGES
github.com/the-tcpdump-group/libpcap/commit/484d60cbf7ca4ec758c3cbb8a82d68b244a78d58
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5P5K3DQ4TFSZBDB3XN4CZNJNQ3UIF3D3/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GBIEKWLNIR62KZ5GA7EDXZS52HU6OE5F/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UZTIPUWABYUE5KQOLCKAW65AUUSB7QO6/
seclists.org/bugtraq/2019/Dec/23
support.apple.com/kb/HT210785
support.apple.com/kb/HT210788
support.apple.com/kb/HT210789
support.apple.com/kb/HT210790
www.oracle.com/security-alerts/cpuapr2020.html
www.tcpdump.org/public-cve-list.txt