CVE-2021-20267

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    CVE-2021-20267

    Published: 28 May 2021Last Modified: 8 Jul 2026

    Summary:

    Details: 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.

    References: https://bugzilla.redhat.com/show_bug.cgi?id=1934330, https://security.openstack.org/ossa/OSSA-2021-001.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 5858f6c5023121ea645c832ab87f078f0249adeb
    Fixed -None

    Affected versions

    18.0.0
    18.0.0.0rc2

    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
    CVE-2021-20267 | CVE-DB