{"id":"CVE-2017-7543","aliases":["GHSA-hvxr-2fvv-c3wq","PYSEC-2026-686"],"url":"https://o3.security/vulnerability/CVE-2017-7543","summary":"OpenStack Neutron Race Condition vulnerability","details":"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.","published":"2018-07-26T14:29:00.483Z","modified":"2026-07-06T08:11:21.850678111Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"neutron","fixedVersion":"7.2.0-12.1"},{"ecosystem":"PyPI","name":"neutron","fixedVersion":"8.3.0-11.1"},{"ecosystem":"PyPI","name":"neutron","fixedVersion":"9.3.1-2.1"},{"ecosystem":"PyPI","name":"neutron","fixedVersion":"10.0.2-1.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"http://www.securityfocus.com/bid/100237"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:2447"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:2448"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:2449"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:2450"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:2451"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:2452"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7543"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-06T08:11:21.850678111Z"}}