An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value.
https://www.debian.org/security/2021/dsa-4983
https://security.openstack.org/ossa/OSSA-2021-005.html
https://lists.debian.org/debian-lts-announce/2022/05/msg00038.html
https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html