tigervnc is vulnerable to denial of service (DoS) attacks. The vulnerability exists as 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.
access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Release_Notes/index.html
access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Technical_Notes/index.html
access.redhat.com/errata/RHSA-2017:0630
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=1323065
bugzilla.redhat.com/show_bug.cgi?id=1378922
bugzilla.redhat.com/show_bug.cgi?id=1390458