CVE-2021-20267

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.

Category

7.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.15%
Vendor Advisory openstack.org
Affected: n/a openstack-neutron
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1934330 patch third party advisory issue tracking
https://security.openstack.org/ossa/OSSA-2021-001.html patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-20267?
CVE-2021-20267 has been scored as a high severity vulnerability.
How to fix CVE-2021-20267?
To fix CVE-2021-20267, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-20267 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-20267 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-20267?
CVE-2021-20267 affects n/a openstack-neutron.
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