CVE-2021-38598: Openstack Neutron

Critical severity, CVSS 9.1. EPSS: 1.2% chance of exploitation in the next 30 days.

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 products

• Openstack Neutron: before 16.4.1 (fixed in 16.4.1); from 17.0.0, before 17.1.3 (fixed in 17.1.3); version 18.0.0 only

Published 2021-08-23. Last modified 2026-06-17.