A mosquitto security update has been released for Debian GNU/Linux 9 LTSto address a security issue.

DLA 2793-1: mosquitto security update

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Debian LTS Advisory DLA-2793-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
October 26, 2021   https://wiki.debian.org/LTS
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Package : mosquitto
Version : 1.4.10-3+deb9u5
CVE ID : CVE-2017-7655

One security issue has been discovered in mosquitto: MQTT message broker.
A null dereference vulnerability was found which could lead to crashes for
applications using the library.

For Debian 9 stretch, this problem has been fixed in version
1.4.10-3+deb9u5.

We recommend that you upgrade your mosquitto packages.

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

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