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

DLA 2915-1: connman security update

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Debian LTS Advisory DLA-2915-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
February 09, 2022   https://wiki.debian.org/LTS
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Package : connman
Version : 1.33-3+deb9u3
CVE ID : CVE-2021-33833 CVE-2022-23096 CVE-2022-23097 CVE-2022-23098

Several issues were found in ConnMan, a connection manager for embedded
devices, that could cause denial of service via service crash or excessive
CPU usage.

For Debian 9 stretch, these problems have been fixed in version
1.33-3+deb9u3.

We recommend that you upgrade your connman packages.

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

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