CVE-2021-20267
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.02%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
- EPSS
- 1.02% probability · 62th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-345
- Affected
- openstack/neutron · redhat/openstack platform
- Source
- secalert@redhat.com
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1934330Issue Tracking, Patch, Third Party Advisory
- https://security.openstack.org/ossa/OSSA-2021-001.htmlPatch, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1934330Issue Tracking, Patch, Third Party Advisory
- https://security.openstack.org/ossa/OSSA-2021-001.htmlPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.