CVE Feed

    Dashboard / CVE / CVE-2021-20267

    CVE-2021-20267

    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.

    Published:Nov 5, 2020
    Last Modified:Nov 21, 2024
    EPS:May 28, 2021
    EPSS Score:0.00123
    CVSS Score:7.1

    Affected Products

    Vendor
    Openstack
    Product
    Neutron
    Vendor
    Redhat
    Product
    Openstack Platform

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-55707 (CVSS 7.1) — In OpenStack Neutron before 28.0.2, the subnetpool onboarding API does not verify ownership of the target subn…
    CVE-2026-50266 (CVSS 2.2) — In OpenStack Neutron before 28.0.1, a project manager can create or update a port on a shared network owned by…
    CVE-2026-49299 (CVSS 5.3) — In OpenStack Neutron before 28.0.1, the tagging controller enforces plural policy action names on single-tag w…
    CVE-2024-53916 (CVSS 7.5) — In OpenStack Neutron before 25.0.1, neutron/extensions/tagging.py can use an incorrect ID during policy enforc…
    CVE-2022-3277 (CVSS 6.5) — An uncontrolled resource consumption flaw was found in openstack-neutron. This flaw allows a remote authentica…
    CVE-2021-40797 (CVSS 6.5) — An issue was discovered in the routes middleware in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 1…
    CVE-2021-40085 (CVSS 6.5) — An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authen…
    CVE-2021-38598 (CVSS 9.1) — OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the…
    CVE-2019-9735 (CVSS 6.5) — An issue was discovered in the iptables firewall module in OpenStack Neutron before 10.0.8, 11.x before 11.0.7…
    CVE-2019-10876 (CVSS 6.5) — An issue was discovered in OpenStack Neutron 11.x before 11.0.7, 12.x before 12.0.6, and 13.x before 13.0.3. B…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High