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CVE-2021-20267

7.1 · HIGH

A flaw was found in openstack-neutron's default Open vSwitch firewall rules.

Published May 28, 2021CWE-345EPSS 1.02%

Overview

CVE-2021-20267 is a high-severity vulnerability. It was published on May 28, 2021 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.redhat.com/show_bug.cgi?id=1934330Refsecurity.openstack.org/ossa/OSSA-2021-001.htmlRefbugzilla.redhat.com/show_bug.cgi?id=1934330Refsecurity.openstack.org/ossa/OSSA-2021-001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20267?

CVE-2021-20267 is a high-severity vulnerability. It was published on May 28, 2021 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2021-20267?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-20267?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-20267?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20267 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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