CVE-2021-40797
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.
Does this matter?
Lower severity and a low EPSS score (1.77%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.77% probability · 78th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-772
- Affected
- openstack/neutron
- Source
- cve@mitre.org
EPSS 1.8% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2021/09/09/2Mailing List, Patch, Third Party Advisory
- https://launchpad.net/bugs/1942179Exploit, Issue Tracking, Third Party Advisory
- https://security.openstack.org/ossa/OSSA-2021-006.htmlPatch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2021/09/09/2Mailing List, Patch, Third Party Advisory
- https://launchpad.net/bugs/1942179Exploit, Issue Tracking, Third Party Advisory
- https://security.openstack.org/ossa/OSSA-2021-006.htmlPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.