Cyber Resilience

CVE-2021-40797

MediumPublic PoC

Published: 08 September 2021

Published
08 September 2021
Modified
21 November 2024
KEV Added
—
Patch
09 September 2021
CVSS Score v3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0069 72.4th percentile
Risk Priority 13 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-40797 is a medium-severity Missing Release of Resource after Effective Lifetime (CWE-772) vulnerability in Openstack Neutron. Its CVSS base score is 6.5 (Medium).

Operationally, ranked in the top 27.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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…

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memory, resulting in API performance degradation or denial of service.

CWE(s)
CWE-772

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

openstack
neutron
≤ 16.4.1 · 17.0.0 — 17.2.1 · 18.0.0 — 18.1.1

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-10 Network Disconnect
addresses: CWE-772

Ensures network resources are released once the session ends or becomes inactive, closing the window for missing-release weaknesses.

References