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Vulnerability record · CVE-2021-38598 · published 23 August 2021

CVE-2021-38598: Openstack neutron authentication bypass by spoofing vulnerability

Openstack · Neutron

OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations.

9.1 CVSS 3.1 Critical EPSS 1.2% · top 32.5% CWE-290 · Authentication bypass by spoofing
9.1CVSS 3.1 base score, v2 5.8
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://launchpad.net/bugs/1938670 ExploitIssue TrackingThird Party Advisory
https://launchpad.net/bugs/1938670 ExploitIssue TrackingThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2015-8914Openstack neutron vulnerabilityThe IPTables firewall in OpenStack Neutron before 7.0.4 and 8.0.0 through 8.1.0 allows remote attackers to bypass an intended ICMPv6-spoofing protect…EPSS 4.3%9.0CVE-2014-0187Openstack neutron permissions and access controls vulnerabilityThe openvswitch-agent process in OpenStack Neutron 2013.1 before 2013.2.4 and 2014.1 before 2014.1.1 allows remote authenticated users to bypass secu…EPSS 2.9%8.2CVE-2016-5363Openstack neutron vulnerabilityThe IPTables firewall in OpenStack Neutron before 7.0.4 and 8.0.0 through 8.1.0 allows remote attackers to bypass an intended MAC-spoofing protection…EPSS 3.3%8.2CVE-2016-5362Openstack neutron vulnerabilityThe IPTables firewall in OpenStack Neutron before 7.0.4 and 8.0.0 through 8.1.0 allows remote attackers to bypass an intended DHCP-spoofing protectio…EPSS 3.4%7.6CVE-2014-3632Openstack neutron permissions and access controls vulnerabilityThe default configuration in a sudoers file in the Red Hat openstack-neutron package before 2014.1.2-4, as used in Red Hat Enterprise Linux Open Stac…EPSS 2.5%7.6CVE-2013-6433Openstack neutron permissions and access controls vulnerabilityThe default configuration in the Red Hat openstack-neutron package before 2013.2.3-7 does not properly set a configuration file for rootwrap, which a…EPSS 3.3%7.1CVE-2021-20267Openstack neutron insufficient verification of data authenticity vulnerabilityA flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server inst…EPSS 1.0%6.5CVE-2022-3277Openstack neutron uncontrolled resource consumption vulnerabilityAn uncontrolled resource consumption flaw was found in openstack-neutron. This flaw allows a remote authenticated user to query a list of security gr…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2021-38598), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.