CVE-2018-14635 is a medium-severity (CVSS 6.5) Improper Input Validation vulnerability in neutron. A fix is available for neutron — see the affected versions and patch details below.
OpensStack Neutron Denial of Service Vulnerability
EPSS Exploitation Probability
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
neutron🐍neutron🐍neutronReal-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
When using the Linux bridge ml2 driver, non-privileged tenants are able to create and attach ports without specifying an IP address, bypassing IP address validation. A potential denial of service could occur if an IP address, conflicting with existing guests or routers, is then assigned from outside of the allowed allocation pool. Versions of openstack-neutron before 13.0.0.0b2, 12.0.3 and 11.0.5 are vulnerable.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | neutron | ≥ 13.0.0.0b1&&< 13.0.0.0b2 | 13.0.0.0b2pip install --upgrade 'neutron==13.0.0.0b2' |
| 🐍PyPI | neutron | all versions | 11.0.6pip install --upgrade 'neutron==11.0.6' |
| 🐍PyPI | neutron | ≥ 12.0.0&&< 12.0.4 | 12.0.4pip install --upgrade 'neutron==12.0.4' |
Affected Products
neutronopenstackopenstackredhatDetection & mitigation playbook
Open-source dependencyDetect
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.
Fix
Update neutron to 13.0.0.0b2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-14635 is resolved across your whole dependency graph.
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.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenStack Platform 10.0 (Newton) | openstack-neutron-1:9.4.1-28.el7ost | RHSA-2018:2715 |
| Red Hat OpenStack Platform 12.0 (Pike) | openstack-neutron-1:11.0.4-6.el7ost | RHSA-2018:3792 |
| Red Hat OpenStack Platform 13.0 (Queens) | openstack-neutron-1:12.0.3-5.el7ost | RHSA-2018:2710 |
Frequently Asked Questions
Is CVE-2018-14635 in your dependencies?
Find it across PyPI, including transitive dependencies.