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Vulnerability record · CVE-2017-7543 · published 26 July 2018

CVE-2017-7543: Openstack neutron race condition vulnerability

Openstack · Neutron

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.

5.9 CVSS 3.0 Medium EPSS 1.8% · top 20.7% CWE-362 · Race condition
5.9CVSS 3.0 base score, v2 4.3
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

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

References

LinkTags
http://www.securityfocus.com/bid/100237 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:2447 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2448 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2449 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2450 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2451 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2452 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7543 Issue TrackingMitigationThird Party Advisory
http://www.securityfocus.com/bid/100237 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:2447 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2448 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2449 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2450 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2451 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2452 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7543 Issue TrackingMitigationThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-7543), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.