{"action":"Upgrade neutron to 15.3.3 or later.","affected":[{"fixed":"15.3.3","introduced":"0"},{"fixed":"16.3.1","introduced":"16.0.0"},{"fixed":"17.1.1","introduced":"17.0.0"}],"component":"neutron","cve_ids":["CVE-2021-20267"],"ecosystem":"PyPI","epss":0.01043,"exploited":false,"fixed_versions":["15.3.3","16.3.1","17.1.1"],"ghsa_id":"GHSA-w8hx-f868-pvch","id":"tcs_01M5KGB7GYCX9AN49HWK6N1DSK","modified_at":"2026-06-10T17:02:23.807508981Z","published_at":"2021-05-28T19:15:00Z","references":["https://osv.dev/vulnerability/PYSEC-2021-136","https://bugzilla.redhat.com/show_bug.cgi?id=1934330","https://github.com/advisories/GHSA-w8hx-f868-pvch"],"severity":{"label":"high","score":7.1},"sources":[{"source":"osv","source_id":"PYSEC-2021-136","url":"https://osv.dev/vulnerability/PYSEC-2021-136"},{"source":"nvd","source_id":"CVE-2021-20267","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20267"}],"summary":"A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonat"}