Networking of Parallels 15.1.4 is Lost after Latest Security Update of macOS Mojave 10.14.6

Right after the latest security update on macOS Mojave 10.14.6, all virtual machines of Parallels Desktop 15.1.4 (Pro) failed to connect to Internet: 1) VMs cannot obtain their dynamic IP addresses from the Mac host, 2) Parallels didn't update the entries of running VMs in Mac's /etc/hosts, and 3) all kinds of VMs are affected: Windows and Linux. I don't know what's happened there, but seems a very bad one that needs a fix immediately.