CVE-2017-7543: Openstack Neutron

Medium severity, CVSS 5.9. EPSS: 1.8% chance of exploitation in the next 30 days.

A race-condition flaw was discovered in openstack-neutron before 7.2.0-12.1, 8.x before 8.3.0-11.1, 9.x before 9.3.1-2.1, and 10.x before 10.0.2-1.1, where, following a minor overcloud update, neutron security groups were disabled. Specifically, the following were reset to 0: net.bridge.bridge-nf-call-ip6tables and net.bridge.bridge-nf-call-iptables. The race was only triggered by an update, at which point an attacker could access exposed tenant VMs and network resources.

Affected products

• Openstack Neutron: from 7.0.0, before 7.2.0-12.1 (fixed in 7.2.0-12.1); from 8.0.0, before 8.3.0-11.1 (fixed in 8.3.0-11.1); from 9.0.0, before 9.3.1-2.1 (fixed in 9.3.1-2.1); from 10.0.0, before 10.0.2-1.1 (fixed in 10.0.2-1.1)
• Red Hat Openstack: version 6.0 only; version 7.0 only; version 8 only; version 9 only; version 10 only; version 11 only

Published 2018-07-26. Last modified 2026-06-17.