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Not in CISA KEV
HIGH severity

CVE-2016-5362 — neutron

HIGH

CVE-2016-5362 is a high-severity (CVSS 8.2) CWE-254 vulnerability in neutron. A fix is available for neutron — see the affected versions and patch details below.

OpenStack Neutron allows remote attackers to bypass an intended DHCP-spoofing protection mechanism

Also known asGHSA-qpwc-p365-pqrrPYSEC-2026-854
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs89th percentile — riskier than 89% of all scored CVEsHighest risk
2.54%4.09%5.63%7.18%6.3%3.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐍neutron🐍neutron

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

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 DHCP-spoofing protection mechanism and consequently cause a denial of service or intercept network traffic via a crafted DHCP discovery message.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIneutronall versions7.0.5pip install --upgrade 'neutron==7.0.5'
🐍PyPIneutron≥ 8.0.0&&< 8.1.18.1.1pip install --upgrade 'neutron==8.1.1'

Affected Products

1 product · 2 configurations
Application
neutronopenstack
≥ 8.0.0 && ≤ 8.1.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for neutron, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update neutron to 7.0.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2016-5362 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatLow
ProductFixed inAdvisory
Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7openstack-neutron-0:2015.1.4-2.el7ostRHSA-2016:1474
Red Hat OpenStack Platform 8.0 (Liberty)openstack-neutron-1:7.0.4-11.el7ostRHSA-2016:1473

Frequently Asked Questions

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 DHCP-spoofing protection mechanism and consequently cause a denial of service or intercept network traffic via a crafted DHCP discovery message.
O3 Security · Impact-Aware SCA

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CVE-2016-5362: neutron DoS — Fixed in 7.0.5