{
  "cveId": "CVE-2021-20267",
  "url": "https://patchblox.com/security/cve/CVE-2021-20267",
  "summary": "CVE-2021-20267 is fixed in 17 products on 1 platform, first by neutron-common 2:12.1.1-0ubuntu8.1, released March 6, 2023. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "neutron-common: A flaw was found in openstack-neutron\u0027s default Open vSwitch firewall rules",
  "description": "A flaw was found in openstack-neutron\u0027s 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.",
  "published": "2021-05-28T12:15:00Z",
  "severity": "Medium",
  "epss": 0.01043,
  "epssPercentile": 0.64326,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "neutron-common",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-common 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-common-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-common",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-common 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-common-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-dhcp-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-dhcp-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-dhcp-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-dhcp-agent",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-dhcp-agent 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-dhcp-agent-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-l3-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-l3-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-l3-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-l3-agent",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-l3-agent 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-l3-agent-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-linuxbridge-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-linuxbridge-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-linuxbridge-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-linuxbridge-agent",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-linuxbridge-agent 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-linuxbridge-agent-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-macvtap-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-macvtap-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-macvtap-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-macvtap-agent",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-macvtap-agent 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-macvtap-agent-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-metadata-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-metadata-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-metadata-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-metadata-agent",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-metadata-agent 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-metadata-agent-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-metering-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-metering-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-metering-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-metering-agent",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-metering-agent 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-metering-agent-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-openvswitch-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-openvswitch-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-openvswitch-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-openvswitch-agent",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-openvswitch-agent 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-openvswitch-agent-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-ovn-metadata-agent",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-ovn-metadata-agent 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-ovn-metadata-agent-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-plugin-linuxbridge-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-plugin-linuxbridge-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-plugin-linuxbridge-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-plugin-ml2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-plugin-ml2 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-plugin-ml2-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-plugin-ml2",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-plugin-ml2 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-plugin-ml2-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-plugin-openvswitch-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-plugin-openvswitch-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-plugin-openvswitch-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-plugin-sriov-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-plugin-sriov-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-plugin-sriov-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-server",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-server 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-server-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-server",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-server 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-server-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-sriov-agent",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "neutron-sriov-agent 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-neutron-sriov-agent-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "neutron-sriov-agent",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "neutron-sriov-agent 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-neutron-sriov-agent-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "python-neutron",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:12.1.1-0ubuntu8.1",
      "fix": "python-neutron 2:12.1.1-0ubuntu8.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python-neutron-2-12.1.1-0ubuntu8.1",
      "released": "2023-03-06T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-neutron",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:16.4.2-0ubuntu6.2",
      "fix": "python3-neutron 2:16.4.2-0ubuntu6.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python3-neutron-2-16.4.2-0ubuntu6.2",
      "released": "2023-03-06T15:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}