A velocity security update has been released for Debian GNU/Linux 9 LTS to address a potential arbitrary code execution vulnerability.

DLA 2595-1: velocity security update

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Debian LTS Advisory DLA-2595-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
March 17, 2021   https://wiki.debian.org/LTS
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Package : velocity
Version : 1.7-5+deb9u1
CVE ID : CVE-2020-13936
Debian Bug : #985220

It was discovered that there was a potential arbitrary code execution
vulnerability in velocity, a Java-based template engine for writing
web applications. It could be exploited by applications which allowed
untrusted users to upload/modify templates.

For Debian 9 "Stretch", this problem has been fixed in version
1.7-5+deb9u1.

We recommend that you upgrade your velocity packages.

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

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