CVE-2021-40797: Openstack Neutron

Medium severity, CVSS 6.5. EPSS: 1.8% chance of exploitation in the next 30 days.

An issue was discovered in the routes middleware in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. By making API requests involving nonexistent controllers, an authenticated user may cause the API worker to consume increasing amounts of memory, resulting in API performance degradation or denial of service.

Affected products

• Openstack Neutron: before 16.4.1 (fixed in 16.4.1); from 17.0.0, before 17.2.1 (fixed in 17.2.1); from 18.0.0, before 18.1.1 (fixed in 18.1.1)

Published 2021-09-08. Last modified 2026-06-17.