A libvncserver security update has been released for CentOS 7.

CentOS-announce: CESA-2020:3281 Important CentOS 7 libvncserver Security Update

CentOS Errata and Security Advisory 2020:3281 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2020:3281

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
6e3bb564a139de89aa75082746181d125ed4c599326591693741010469bbd88e libvncserver-0.9.9-14.el7_8.1.i686.rpm
cc9eef61c95aebbc7a432d58f5f85fbab25f19ee777834f671bc23fa94964d57 libvncserver-0.9.9-14.el7_8.1.x86_64.rpm
27fd50136804eda5f0c7bfe32a61dcd680349725916fcebde89f0c8a2e549767 libvncserver-devel-0.9.9-14.el7_8.1.i686.rpm
2b6dd64d39816de5f6fd5330c2e6b95ae66fa3c853d61272092b0a027fbd1da3 libvncserver-devel-0.9.9-14.el7_8.1.x86_64.rpm

Source:
81f064d3624ca56c60a31e1328be3cc2ddf66aecceadabc2c7fa3195e20dfb40 libvncserver-0.9.9-14.el7_8.1.src.rpm