CVE-2021-40797

Publication date 8 September 2021

Last updated 18 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
neutron	26.04 LTS resolute	Not affected
	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Ignored end of life
	20.04 LTS focal	Fixed 2:16.4.2-0ubuntu6.2
	18.04 LTS bionic	Fixed 2:12.1.1-0ubuntu8.1
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Not in release

Notes

mdeslaur

This issue was fixed in (2:16.4.1-0ubuntu2) in focal-updates and (2:18.1.1-0ubuntu2) in hirsute-updates, and was later released to -security.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
neutron	Upstream: dfbb9bc

Severity score breakdown

CVSS version: CVSS v3.0

Base score 6.5 · Medium

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	None
Availability impact	High

Scores

Parameter	Value
Base score	6.5 · Medium
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-6067-1
OpenStack Neutron vulnerabilities
10 May 2023

Other references

https://www.cve.org/CVERecord?id=CVE-2021-40797