The Xvnc server in TigerVNC allows remote attackers to cause a denial of service (invalid memory access and crash) by terminating a TLS handshake early.
http://lists.opensuse.org/opensuse-security-announce/2017-02/msg00020.html
http://rhn.redhat.com/errata/RHSA-2017-0630.html
https://access.redhat.com/errata/RHSA-2017:2000
https://bugzilla.suse.com/show_bug.cgi?id=1023012
https://github.com/TigerVNC/tigervnc/commit/8aa4bc53206c2430bbf0c8f4b642f59a379ee649
https://security.gentoo.org/glsa/201801-13