A libmodbus security update has been released for Debian GNU/Linux 9 LTS.

DLA 2825-1: libmodbus security update

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Debian LTS Advisory DLA-2825-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
November 22, 2021   https://wiki.debian.org/LTS
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Package : libmodbus
Version : 3.0.6-2+deb9u1
CVE ID : CVE-2019-14462 CVE-2019-14463

Two issues have been found in libmodbus, a library for the Modbus
protocol.
Both issues are related to out of bound reads, which could result in a
denial of service or other unspecified impact.

For Debian 9 stretch, these problems have been fixed in version
3.0.6-2+deb9u1.

We recommend that you upgrade your libmodbus packages.

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

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