A neutron security update has been released for Debian GNU/Linux 10 and 11 to address a vulnerability which allowed a reconfiguration of dnsmasq via crafted dhcp_extra_opts parameters.

DSA 4983-1: neutron security update

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Debian Security Advisory DSA-4983-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
October 10, 2021   https://www.debian.org/security/faq
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Package : neutron
CVE ID : CVE-2021-40085
Debian Bug : 993398

Pavel Toporkov discovered a vulnerability in Neutron, the OpenStack
virtual network service, which allowed a reconfiguration of dnsmasq
via crafted dhcp_extra_opts parameters.

For the oldstable distribution (buster), this problem has been fixed
in version 2:13.0.7+git.2021.09.27.bace3d1890-0+deb10u1. This update
also fixes CVE-2021-20267.

For the stable distribution (bullseye), this problem has been fixed in
version 2:17.2.1-0+deb11u1. This update also fixes CVE-2021-38598.

We recommend that you upgrade your neutron packages.

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/