---
id: CVE-2017-7543
aliases:
  - GHSA-hvxr-2fvv-c3wq
  - PYSEC-2026-686
title: OpenStack Neutron Race Condition vulnerability
summary: OpenStack Neutron Race Condition vulnerability
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'
vendor: neutron
product: neutron
ecosystem: pip
affected:
  - neutron < 7.2.0-12.1
  - 'neutron >= 8.0.0, < 8.3.0-11.1'
  - 'neutron >= 9.0.0, < 9.3.1-2.1'
  - 'neutron >= 10.0.0, < 10.0.2-1.1'
patched:
  - neutron 7.2.0-12.1
  - neutron 8.3.0-11.1
  - neutron 9.3.1-2.1
  - neutron 10.0.2-1.1
published: '2022-05-13'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:33.795227363Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-hvxr-2fvv-c3wq'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2017-7543'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2447'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2448'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2449'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2450'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2451'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2452'
  - url: 'https://access.redhat.com/security/cve/CVE-2017-7543'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1473792'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7543'
  - url: 'https://opendev.org/openstack/neutron'
  - url: >-
      https://web.archive.org/web/20200227153412/https://www.securityfocus.com/bid/100237
tags:
  - osv
  - pip
epss: 0.01849
epssPercentile: 0.77847
ingestedAt: '2026-07-08T18:25:50.324Z'
---

## Overview

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 packages

- `neutron < 7.2.0-12.1`
- `neutron >= 8.0.0, < 8.3.0-11.1`
- `neutron >= 9.0.0, < 9.3.1-2.1`
- `neutron >= 10.0.0, < 10.0.2-1.1`

## Remediation

Upgrade to a patched release:

- `neutron 7.2.0-12.1`
- `neutron 8.3.0-11.1`
- `neutron 9.3.1-2.1`
- `neutron 10.0.2-1.1`