OpenstackApplication · Redhat
CVE-2019-10876
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn issue was discovered in OpenStack Neutron 11.x before 11.0.7, 12.x before 12.0.6, and 13.x before 13.0.3. By creating two security groups with separate/overlapping port ranges, an authenticated user may prevent Neutron from being able to configure networks on any compute nodes where those security groups are present, because of an Open vSwitch (OVS) firewall KeyError. All Neutron deployments utilizing neutron-openvswitch-agent are affected.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceIn OpenStack Neutron versions 11.x before 11.0.7, 12.x before 12.0.6, and 13.x before 13.0.3, an authenticated user can create two security groups with separate or overlapping port ranges, triggering a KeyError in the Open vSwitch (OVS) firewall driver. This error prevents Neutron from configuring networks on any compute nodes where those security groups are present.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
OpenstackApplication
= 13= 14>= 11.0.0, < 11.0.7>= 12.0.0, < 12.0.6>= 13.0.0, < 13.0.3CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed Neutron versionRun 'neutron --version' or check the neutron package version with 'rpm -q neutron' or 'dpkg -l neutron-common'Affected if Version is 11.0.0-11.0.6, 12.0.0-12.0.5, or 13.0.0-13.0.2
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Verify OVS firewall driver is enabledCheck neutron configuration files (typically /etc/neutron/plugins/ml2/openvswitch_agent.ini) for 'firewall_driver' setting under [securitygroup] section, or run 'grep -r firewall_driver /etc/neutron/'Affected if Driver is set to openvswitch or a variant of OVS firewall driver
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Identify security groups with overlapping port rangesList all security groups with 'neutron security-group-list' or 'openstack security group list', then inspect rules with 'neutron security-group-rules-list' or 'openstack security group rule list' to find groups with duplicate or overlapping port ranges on the same protocolAffected if Multiple security groups exist containing rules with overlapping or separately defined port ranges on the same protocol
Environment is affected if Neutron version is vulnerable AND OVS firewall driver is in use AND security groups with overlapping port ranges exist in the deployment
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data11.0.712.0.613.0.3
Upgrade Neutron to version 11.0.7, 12.0.6, or 13.0.3 or later to resolve the KeyError in the OVS firewall when handling overlapping security group port ranges.
Fix this in Openstack
Scoped from the published advisory
- Consultation6.0 h
- Implementation12.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,448.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-10876 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2019-10876 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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