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Vulnerabilities / CVE-2021-38598

critical

CVE-2021-38598

openstack-neutron: Linuxbridge ARP filter bypass on Netfilter platforms

Published Modified CWE 290
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
GHSA8.8CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Red Hat5.9CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by GHSA (high), Red Hat (medium), Ubuntu (medium).

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.

Affected packages and fixed versions

SourcePackageFixed in
debian 10neutronno fix listed
debian 11neutron2:17.2.1-0+deb11u1
debian 12neutron2:18.1.0-2
debian 13neutron2:18.1.0-2
debian 14neutron2:18.1.0-2
debian 9neutronno fix listed
echoneutron2:18.1.0-2
pip::GitHub Security Advisory pipneutron16.4.1, 17.1.3
Red Hatopenstack-neutron, openstack-neutron-common, openstack-neutron-linuxbridge and 9 moreno fix listed
ubuntu 18.04neutron2:12.1.1-0ubuntu8.1
ubuntu 18.04-ESMneutron2:12.1.1-0ubuntu8.1
ubuntu 20.04neutron2:16.4.2-0ubuntu6.2
Show all 24 entries from 13 sources
SourcePackageFixed in
debian 10neutronno fix listed
debian 11neutron2:17.2.1-0+deb11u1
debian 12neutron2:18.1.0-2
debian 13neutron2:18.1.0-2
debian 14neutron2:18.1.0-2
debian 9neutronno fix listed
echoneutron2:18.1.0-2
pip::GitHub Security Advisory pipneutron16.4.1, 17.1.3
Red Hatopenstack-neutronno fix listed
Red Hatopenstack-neutron-commonno fix listed
Red Hatopenstack-neutron-linuxbridgeno fix listed
Red Hatopenstack-neutron-macvtap-agentno fix listed
Red Hatopenstack-neutron-metering-agentno fix listed
Red Hatopenstack-neutron-ml2no fix listed
Red Hatopenstack-neutron-openvswitchno fix listed
Red Hatopenstack-neutron-ovn-metadata-agentno fix listed
Red Hatopenstack-neutron-ovn-migration-toolno fix listed
Red Hatopenstack-neutron-rpc-serverno fix listed
Red Hatopenstack-neutron-sriov-nic-agentno fix listed
Red Hatpython3-neutronno fix listed
ubuntu 18.04neutron2:12.1.1-0ubuntu8.1
ubuntu 18.04-ESMneutron2:12.1.1-0ubuntu8.1
ubuntu 20.04neutron2:16.4.2-0ubuntu6.2
ubuntu 20.04-ESMneutron2:16.4.2-0ubuntu6.2

References

All 13 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.