{"id":"CVE-2021-20267","aliases":["DEBIAN-CVE-2021-20267","EUVD-2021-0142","GHSA-w8hx-f868-pvch","PYSEC-2021-136","UBUNTU-CVE-2021-20267","USN-6067-1"],"status":"published","title":"Openstack Neutron has Insufficient Verification of IPv6 addresses","description":"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 impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.01043,"percentile":0.64564,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-345"],"published":"2021-05-28T18:46:11Z","modified":"2026-10-24T10:30:57Z","fixes":[{"ecosystem":"PyPI","package":"neutron","fixed_in":["16.3.1","15.3.3","17.1.1"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"neutron","fixed_in":["2:17.1.1-5"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"neutron","fixed_in":["2:17.1.1-5"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"neutron","fixed_in":["2:17.1.1-5"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"neutron","fixed_in":["2:12.1.1-0ubuntu8.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"neutron","fixed_in":["2:16.4.2-0ubuntu6.2"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"16.0.0"},{"fixed":"16.3.1"}]}]},{"source":"ghsa","ecosystem":"PyPI","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"15.3.3"}]}]},{"source":"ghsa","ecosystem":"PyPI","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"17.0.0"},{"fixed":"17.1.1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:17.1.1-5"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:17.1.1-5"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:17.1.1-5"}]}]},{"source":"osv","ecosystem":"PyPI","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"16.0.0"},{"fixed":"16.3.1"}]}],"versions":["16.0.0","16.1.0","16.2.0","16.3.0"]},{"source":"osv","ecosystem":"PyPI","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"15.3.3"}]}],"versions":["0.0","10.0.5","10.0.6","10.0.7","11.0.3","11.0.4","11.0.5","11.0.6","11.0.7","11.0.8","12.0.0","12.0.0.0b3","12.0.0.0rc1","12.0.0.0rc2","12.0.1","12.0.2","12.0.3","12.0.4","12.0.5","12.0.6","12.1.0","12.1.1","13.0.0","13.0.0.0b1","13.0.0.0b2","13.0.0.0b3","13.0.0.0rc1","13.0.0.0rc2","13.0.1","13.0.2","13.0.3","13.0.4","13.0.5","13.0.6","13.0.7","14.0.0","14.0.0.0b1","14.0.0.0b2","14.0.0.0b3","14.0.0.0rc1","14.0.1","14.0.2","14.0.3","14.0.4","14.1.0","14.2.0","14.3.0","14.3.1","14.4.0","14.4.1","14.4.2","15.0.0","15.0.0.0b1","15.0.0.0rc1","15.0.0.0rc2","15.0.1","15.0.2","15.1.0","15.2.0","15.3.0","15.3.1","15.3.2"]},{"source":"osv","ecosystem":"PyPI","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"17.0.0"},{"fixed":"17.1.1"}]}],"versions":["17.0.0","17.1.0"]},{"source":"osv","ecosystem":"PyPI","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"15.3.3"},{"introduced":"16.0.0"},{"fixed":"16.3.1"},{"introduced":"17.0.0"},{"fixed":"17.1.1"}]}],"versions":["0.0","10.0.5","10.0.6","10.0.7","11.0.3","11.0.4","11.0.5","11.0.6","11.0.7","11.0.8","12.0.0","12.0.0.0b3","12.0.0.0rc1","12.0.0.0rc2","12.0.1","12.0.2","12.0.3","12.0.4","12.0.5","12.0.6","12.1.0","12.1.1","13.0.0","13.0.0.0b1","13.0.0.0b2","13.0.0.0b3","13.0.0.0rc1","13.0.0.0rc2","13.0.1","13.0.2","13.0.3","13.0.4","13.0.5","13.0.6","13.0.7","14.0.0","14.0.0.0b1","14.0.0.0b2","14.0.0.0b3","14.0.0.0rc1","14.0.1","14.0.2","14.0.3","14.0.4","14.1.0","14.2.0","14.3.0","14.3.1","14.4.0","14.4.1","14.4.2","15.0.0","15.0.0.0b1","15.0.0.0rc1","15.0.0.0rc2","15.0.1","15.0.2","15.1.0","15.2.0","15.3.0","15.3.1","15.3.2","16.0.0","16.1.0","16.2.0","16.3.0","17.0.0","17.1.0"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:7.0.0-0ubuntu1","2:8.0.0~b1-0ubuntu2","2:8.0.0~b2-0ubuntu4","2:8.0.0~b2-0ubuntu5","2:8.0.0~b2-0ubuntu7","2:8.0.0~b3-0ubuntu1","2:8.0.0~rc1-0ubuntu1","2:8.0.0-0ubuntu1","2:8.1.0-0ubuntu0.16.04.2","2:8.1.2-0ubuntu1","2:8.2.0-0ubuntu1","2:8.3.0-0ubuntu1","2:8.3.0-0ubuntu1.1","2:8.3.0-0ubuntu1.2","2:8.4.0-0ubuntu1","2:8.4.0-0ubuntu2","2:8.4.0-0ubuntu3","2:8.4.0-0ubuntu4","2:8.4.0-0ubuntu5","2:8.4.0-0ubuntu6","2:8.4.0-0ubuntu7.1","2:8.4.0-0ubuntu7.2","2:8.4.0-0ubuntu7.3","2:8.4.0-0ubuntu7.4","2:8.4.0-0ubuntu7.5"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:12.1.1-0ubuntu8.1"}]}],"versions":["2:11.0.1-0ubuntu1","2:12.0.0~b1-0ubuntu1","2:12.0.0~b1-0ubuntu2","2:12.0.0~b2-0ubuntu1","2:12.0.0~b3-0ubuntu1","2:12.0.0~rc1-0ubuntu1","2:12.0.0~rc2-0ubuntu1","2:12.0.0-0ubuntu1","2:12.0.0-0ubuntu1.1","2:12.0.0-0ubuntu1.2"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openstack project","product":"openstack-neutron"}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1934330","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix","web","report"]},{"url":"https://security.openstack.org/ossa/OSSA-2021-001.html","tags":["x_refsource_CONFIRM","x_transferred","Patch","Vendor 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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 impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.","status":"published","published":"2021-05-28T18:46:11Z","modified":"2024-08-03T17:37:23.213Z","cwes":["CWE-345"],"updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-0142","description":"A flaw was found in openstack-neutron's default Open vSwitch firewall rules. 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By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.","status":"published","published":"2021-05-28T19:15:07.483Z","modified":"2026-06-17T03:33:34.5Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5.5,"vector":"AV:N/AC:L/Au:S/C:P/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-345"],"updated_at":"2026-11-02T14:06:53.987491Z"}],"osv":[{"id":"CVE-2021-20267","description":"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 impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.","status":"published","published":"2021-05-28T19:15:07.483Z","modified":"2026-10-24T10:30:57.171572321Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:18.004149Z"},{"id":"DEBIAN-CVE-2021-20267","description":"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 impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. 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Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.","status":"published","published":"2022-05-24T19:03:37Z","modified":"2024-09-26T15:10:49.249796Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high"},{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-345"],"updated_at":"2026-11-02T15:46:58.401149Z"},{"id":"UBUNTU-CVE-2021-20267","description":"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 impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.","status":"published","published":"2021-05-28T19:15:00Z","modified":"2026-02-04T02:44:52.142107Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:25.728622Z"},{"id":"PYSEC-2021-136","description":"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 impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.","status":"published","published":"2021-05-28T19:15:00Z","modified":"2026-06-10T17:02:23.807508981Z","updated_at":"2026-11-02T15:52:52.682031Z"},{"id":"USN-6067-1","title":"neutron vulnerabilities","description":"David Sinquin discovered that OpenStack Neutron incorrectly handled the\ndefault Open vSwitch firewall rules. An attacker could possibly use this\nissue to impersonate the IPv6 addresses of other systems on the network.\nThis issue only affected Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.\n(CVE-2021-20267)\n\nJake Yip and Justin Mammarella discovered that OpenStack Neutron\nincorrectly handled the linuxbridge driver when ebtables-nft is being\nused. An attacker could possibly use this issue to impersonate the hardware\naddresss of other systems on the network. This issue only affected Ubuntu\n18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2021-38598)\n\nPavel Toporkov discovered that OpenStack Neutron incorrectly handled\nextra_dhcp_opts values. An attacker could possibly use this issue to\nreconfigure dnsmasq. This issue only affected Ubuntu 18.04 LTS, and Ubuntu\n20.04 LTS. (CVE-2021-40085)\n\nSlawek Kaplonski discovered that OpenStack Neutron incorrectly handled the\nroutes middleware. An attacker could possibly use this issue to cause the\nAPI worker to consume memory, leading to a denial of service. This issue\nonly affected Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2021-40797)\n\nIt was discovered that OpenStack Neutron incorrectly handled certain\nqueries. A remote authenticated user could possibly use this issue to cause\nresource consumption, leading to a denial of service. (CVE-2022-3277)\n","status":"published","published":"2023-05-10T11:30:08Z","modified":"2026-04-27T16:40:25.276108Z","updated_at":"2026-11-02T16:58:16.738762Z"}]}}