Insufficient Verification of Data Authenticity Affecting neutron package, versions <2:17.1.1-5


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
1.02% (61st percentile)

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  • Snyk IDSNYK-ECHOLATEST-NEUTRON-18496099
  • published1 Aug 2026
  • disclosed28 May 2021

Introduced: 28 May 2021

CVE-2021-20267  (opens in a new tab)
CWE-345  (opens in a new tab)

How to fix?

Upgrade Echo:latest neutron to version 2:17.1.1-5 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream neutron package and not the neutron package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.

CVSS Base Scores

version 3.1