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MEDIUM severity

CVE-2018-14636 — neutron

MEDIUM

CVE-2018-14636 is a medium-severity (CVSS 5.3) CWE-300 vulnerability in neutron. A fix is available for neutron — see the affected versions and patch details below.

Openstack Neutron vulnerable to eavesdropping on private traffic

Also known asGHSA-8q95-jj7p-x93xPYSEC-2018-94
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs68th percentile — riskier than 68% of all scored CVEsHighest risk
0.00%0.56%1.12%1.67%0.2%1.2%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

3 pkgs affected
🐍neutron🐍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

Live-migrated instances are briefly able to inspect traffic for other instances on the same hypervisor. This brief window could be extended indefinitely if the instance's port is set administratively down prior to live-migration and kept down after the migration is complete. This is possible due to the Open vSwitch integration bridge being connected to the instance during migration. When connected to the integration bridge, all traffic for instances using the same Open vSwitch instance would potentially be visible to the migrated guest, as the required Open vSwitch VLAN filters are only applied post-migration. Versions of openstack-neutron before 13.0.0.0b2, 12.0.3, 11.0.5 are vulnerable.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIneutron≥ 13.0.0.0b1&&< 13.0.0.0b213.0.0.0b2pip install --upgrade 'neutron==13.0.0.0b2'
🐍PyPIneutron≥ 12.0.0&&< 12.0.312.0.3pip install --upgrade 'neutron==12.0.3'
🐍PyPIneutron≥ 11.0.0&&< 11.0.511.0.5pip install --upgrade 'neutron==11.0.5'

Affected Products

1 product · 3 configurations
Application
neutronopenstack
≥ 12.0.0 && ≤ 12.0.2
1 version
13.0.0

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 13.0.0.0b2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-14636 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Live-migrated instances are briefly able to inspect traffic for other instances on the same hypervisor. This brief window could be extended indefinitely if the instance's port is set administratively down prior to live-migration and kept down after the migration is complete. This is possible due to the Open vSwitch integration bridge being connected to the instance during migration. When connected to the integration bridge, all traffic for instances using the same Open vSwitch instance would potentially be visible to the migrated guest, as the required Open vSwitch VLAN filters are only applie
O3 Security · Impact-Aware SCA

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CVE-2018-14636: neutron — Fixed in 13.0.0.0b2