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OpenStack Compute (Nova) Denial of service via a large number of calls to the addFixedIp functionGHSA-63fq-8fp9-vhwq

MEDIUMFix: openstack/nova@9561484

GHSA-63fq-8fp9-vhwq is a medium-severity (CVSS 6.5) CWE-399 vulnerability in nova. A fix is available for nova — see the affected versions and patch details below.

Also known asCVE-2013-1838PYSEC-2013-44
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs86th percentile — riskier than 86% of all scored CVEsHighest risk
0.93%1.70%2.47%3.24%1.4%2.7%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

1 pkg affected
🐍nova

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

OpenStack Compute (Nova) Grizzly, Folsom (2012.2), and Essex (2012.1) does not properly implement a quota for fixed IPs, which allows remote authenticated users to cause a denial of service (resource exhaustion and failure to spawn new instances) via a large number of calls to the addFixedIp function.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPInovaall versions12.0.0a0pip install --upgrade 'nova==12.0.0a0'

Affected Products

4 products · 6 configurations
OS
ubuntu linuxcanonical
3 versions
11.1012.0412.10
Application
essexopenstack
1 version
2012.1
Application
folsomopenstack
1 version
2012.2
Application
grizzlyopenstack
1 version
2012.2

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update nova to 12.0.0a0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-63fq-8fp9-vhwq 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
OpenStack Folsom for RHEL 6openstack-nova-0:2012.2.3-7.el6ostRHSA-2013:0709

Frequently Asked Questions

OpenStack Compute (Nova) Grizzly, Folsom (2012.2), and Essex (2012.1) does not properly implement a quota for fixed IPs, which allows remote authenticated users to cause a denial of service (resource exhaustion and failure to spawn new instances) via a large number of calls to the addFixedIp function.
O3 Security · Impact-Aware SCA

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OpenStack Compute (Nova) Denial of service via a large…