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CRITICAL severity

OpenStack Neutron vulnerable to hardware address impersonationGHSA-hvm4-mc7m-22w4

CRITICALFix: openstack/neutron@0a93139

GHSA-hvm4-mc7m-22w4 is a critical-severity (CVSS 9.1) CWE-290 vulnerability in neutron. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for neutron — see the affected versions and patch details below.

Also known asCVE-2021-38598PYSEC-2021-360
Published
Updated
Affected
3 pkgs
Patched
2 / 3
Exploits
1 known
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk-0.00%
Lower risk than most CVEs69th percentile — riskier than 69% of all scored CVEsHighest risk
0.00%0.57%1.15%1.72%0.0%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

OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations.

Affected Packages

3 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIneutronall versions16.4.1pip install --upgrade 'neutron==16.4.1'
🐍PyPIneutron≥ 17.0.0&&< 17.1.317.1.3pip install --upgrade 'neutron==17.1.3'
🐍PyPIneutronall versionsNo fix

Affected Products

1 product · 3 configurations
Application
neutronopenstack
≥ 17.0.0 && < 17.1.3
1 version
18.0.0
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows h…

launchpad.netNVDAug 2021

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 16.4.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hvm4-mc7m-22w4 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.

Frequently Asked Questions

OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations.
O3 Security · Impact-Aware SCA

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OpenStack Neutron vulnerable to hardware address…