A inetutils security update has been released for Debian GNU/Linux 9 LTS to address an arbitrary remote code execution issue.

DLA 2341-1: inetutils security update

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Debian LTS Advisory DLA-2341-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/
August 24, 2020   https://wiki.debian.org/LTS
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Package : inetutils
Version : 2:1.9.4-2+deb9u1
CVE ID : CVE-2020-10188
Debian Bug : 956084

In inetutils-telnetd, an implementation of a telnet daemon,
arbitrary remote code execution might have been possible via
short writes or urgent data.

For Debian 9 stretch, this problem has been fixed in version
2:1.9.4-2+deb9u1.

We recommend that you upgrade your inetutils-telnetd packages.

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

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