CVE-2021-40797: n/a vulnerability

CVE-2021-40797: An issue was discovered in the routes middleware in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, an...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 4, 2024, 02:51 UTC (UTC+00:00)

Security readout for executives and security teams

This vulnerability lets an authenticated OpenStack Neutron user make certain invalid API requests that cause API workers to consume more memory over time. The likely business impact is degraded networking API performance or denial of service for cloud networking operations. Exposure is most relevant to OpenStack environments running affected Neutron releases where tenants, users, or automation have authenticated access to the Neutron API. Prioritize remediation for multi-tenant or externally reachable OpenStack control planes. This is not shown as actively exploited, but it can disrupt cloud networking operations if authenticated access is abused. Mitigation focus: Upgrade Neutron to 16.4.1, 17.2.1, 18.1.1, or later supported vendor packages.; Review OpenStack OSSA-2021-006 and distribution guidance for applicable backports.; Restrict Neutron API access to necessary authenticated users and trusted network paths..

Prepared: Jun 2, 2026, 18:39 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Sep 8, 2021, 19:11 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://launchpad.net/bugs/1942179CVE reference · x_refsource_MISC
https://security.openstack.org/ossa/OSSA-2021-006.htmlCVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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