qemu is vulnerable to denial of service (DoS). The vulnerability exists as vnc has memory leakage upon disconnect.
lists.opensuse.org/opensuse-security-announce/2020-04/msg00007.html
www.openwall.com/lists/oss-security/2020/03/05/1
access.redhat.com/errata/RHSA-2020:3267
access.redhat.com/security/updates/classification/#low
git.qemu.org/?p=qemu.git;a=commit;h=6bf21f3d83e95bcc4ba35a7a07cc6655e8b010b0
lists.debian.org/debian-lts-announce/2020/07/msg00020.html
usn.ubuntu.com/4372-1/
www.debian.org/security/2020/dsa-4665