Security updates for Monday

Security updates have been issued by Debian (clamav, firefox-esr, pidgin, and thunderbird), Fedora (dotnet3.1, firefox, kernel, vim, and webkit2gtk3), Mageia (firefox/nss/nspr, gimp, logrotate, mariadb, thunderbird, trojita, webkit2, and webmin), Oracle (thunderbird), Red Hat (compat-openssl11, postgresql:10, postgresql:12, and thunderbird), Slackware (pidgin), and SUSE (openvpn).