Vulnerability Name:

CVE-2021-20267 (CCN-202766)

Assigned:2020-12-17
Published:2021-05-28
Updated:2022-10-07
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 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.
CVSS v3 Severity:7.1 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H)
6.2 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): None
Availibility (A): High
7.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H)
6.2 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.5 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): Partial
7.5 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-345
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-20267

Source: CCN
Type: Red Hat Bugzilla – Bug 1934330
(CVE-2021-20267) - CVE-2021-20267 openstack-neutron: Anti-spoofing bypass using Open vSwitch

Source: MISC
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1934330

Source: XF
Type: UNKNOWN
openstack-cve202120267-dos(202766)

Source: CONFIRM
Type: Patch, Vendor Advisory
https://security.openstack.org/ossa/OSSA-2021-001.html

Source: CCN
Type: OpenStack Web site
Neutron

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-20267

Vulnerable Configuration:Configuration 1:
  • cpe:/a:openstack:neutron:18.0.0:*:*:*:*:*:*:*
  • OR cpe:/a:openstack:neutron:*:*:*:*:*:*:*:* (Version >= 17.0.0 and < 17.1.3)
  • OR cpe:/a:openstack:neutron:*:*:*:*:*:*:*:* (Version < 16.3.3)

    • Configuration 2:
  • cpe:/a:redhat:openstack_platform:16.1:*:*:*:*:*:*:*
  • OR cpe:/a:redhat:openstack_platform:13.0:*:*:*:*:*:*:*
  • OR cpe:/a:redhat:openstack_platform:10.0:*:*:*:*:*:*:*
  • OR cpe:/a:redhat:openstack_platform:16.2:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:openstack:neutron:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    openstack neutron 18.0.0
    openstack neutron *
    openstack neutron *
    redhat openstack platform 16.1
    redhat openstack platform 13.0
    redhat openstack platform 10.0
    redhat openstack platform 16.2
    openstack neutron *