A vim security update has been released for Debian GNU/Linux 9 LTS to address multiple issues.

DLA 2876-1: vim security update

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Debian LTS Advisory DLA-2876-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
January 10, 2022   https://wiki.debian.org/LTS
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Package : vim
Version : 2:8.0.0197-4+deb9u4
CVE ID : CVE-2017-17087 CVE-2019-20807 CVE-2021-3778 CVE-2021-3796

Multiple issues have been discovered in vim: an enhanced vi text editor:

CVE-2017-17087
fileio.c in Vim sets the group ownership of a .swp file to the editor's primary
group (which may be different from the group ownership of the original file),
which allows local users to obtain sensitive information by leveraging an
applicable group membership.

CVE-2019-20807
Users can circumvent the rvim restricted mode and execute arbitrary OS
commands via scripting interfaces (e.g., Python, Ruby, or Lua).

CVE-2021-3778
Heap-based Buffer Overflow with invalid utf-8 character was detected in
regexp_nfa.c.

CVE-2021-3796
Heap Use-After-Free memory error was detected in normal.c. A successful
exploitation may lead to code execution.

For Debian 9 stretch, these problems have been fixed in version
2:8.0.0197-4+deb9u4.

We recommend that you upgrade your vim packages.

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

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