A libvncserver security update has been released for Debian GNU/Linux 9 LTS to address a denial of service issue.

DLA 2451-1: libvncserver security update

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Debian LTS Advisory DLA-2451-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
November 15, 2020   https://wiki.debian.org/LTS
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Package : libvncserver
Version : 0.9.11+dfsg-1.3~deb9u6
CVE ID : CVE-2020-25708

An issue has been found in libvncserver, an API to write one's own VNC
server.
Due to some missing checks, a divide by zero could happen, which could
result in a denial of service.

For Debian 9 stretch, this problem has been fixed in version
0.9.11+dfsg-1.3~deb9u6.

We recommend that you upgrade your libvncserver packages.

For the detailed security status of libvncserver please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libvncserver

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS