{"cve":"CVE-2021-40797","nvd":{"published":"2021-09-08T20:15:11.060","modified":"2026-06-17T04:07:27.940","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-772"],"references":["http://www.openwall.com/lists/oss-security/2021/09/09/2","https://launchpad.net/bugs/1942179","https://security.openstack.org/ossa/OSSA-2021-006.html","http://www.openwall.com/lists/oss-security/2021/09/09/2","https://launchpad.net/bugs/1942179"],"products":["openstack:neutron"],"source":"nvd","synced_at":"2026-10-19T21:23:41.316049955+00:00"},"epss":{"cve":"CVE-2021-40797","score":0.01774,"percentile":0.78189,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-cpx3-696p-3cw9","url":"https://osv.dev/vulnerability/GHSA-cpx3-696p-3cw9","summary":"OpenStack Neutron Denial of Service vulnerability","modified":"2024-09-25T18:02:41.890251Z","packages":[{"ecosystem":"PyPI","name":"neutron","purl":"pkg:pypi/neutron","ranges":["<16.4.1"],"fixed":["16.4.1"]},{"ecosystem":"PyPI","name":"neutron","purl":"pkg:pypi/neutron","ranges":[">=17.0.0 <17.2.1"],"fixed":["17.2.1"]},{"ecosystem":"PyPI","name":"neutron","purl":"pkg:pypi/neutron","ranges":[">=18.0.0 <18.1.1"],"fixed":["18.1.1"]}]},{"id":"PYSEC-2021-329","url":"https://osv.dev/vulnerability/PYSEC-2021-329","summary":"","modified":"2026-06-10T17:02:23.751801879Z","packages":[{"ecosystem":"PyPI","name":"neutron","purl":"pkg:pypi/neutron","ranges":["<16.4.1",">=17.0.0 <17.2.1",">=18.0.0 <18.1.1"],"fixed":["16.4.1","17.2.1","18.1.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}