{"id":"CVE-2021-40085","aliases":["GHSA-fh73-gjvg-349c","PYSEC-2021-361"],"url":"https://o3.security/vulnerability/CVE-2021-40085","summary":"OpenStack Neutron vulnerable to authenticated attackers reconfiguring dnsmasq via crafted extra_dhcp_opts value","details":"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.","published":"2021-08-31T18:15:08.837Z","modified":"2026-07-08T05:57:19.837370286Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"PyPI","name":"neutron","fixedVersion":"16.4.1"},{"ecosystem":"PyPI","name":"neutron","fixedVersion":"17.2.1"},{"ecosystem":"PyPI","name":"neutron","fixedVersion":"18.1.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/05/msg00038.html"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4983"},{"type":"REPORT","url":"https://launchpad.net/bugs/1939733"},{"type":"FIX","url":"http://www.openwall.com/lists/oss-security/2021/08/31/2"},{"type":"FIX","url":"https://security.openstack.org/ossa/OSSA-2021-005.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T05:57:19.837370286Z"}}