Security readout for executives and security teams
OpenStack Neutron had a flaw where a logged-in cloud user could submit crafted DHCP option data and cause Neutron’s dnsmasq configuration to be changed in unintended ways. This affects older Neutron 16.x, 17.x, and 18.x releases. The public bundle does not provide CVSS, confirmed impact details, or active exploitation evidence. Exposure is most likely in OpenStack clouds running vulnerable Neutron versions with DHCP services backed by dnsmasq. Risk depends on whether authenticated users can set extra_dhcp_opts through Neutron APIs or tenant workflows. Debian-packaged Neutron deployments should also check the listed Debian advisories. Treat this as a cloud control-plane hygiene issue for affected OpenStack environments. It is not KEV-listed and lacks public CVSS in the bundle, but authenticated tenant-level abuse against networking services can still create material operational risk. Mitigation focus: Upgrade Neutron to 16.4.1, 17.2.1, 18.1.1, or later as applicable.; Apply relevant Debian neutron security updates if using Debian packages.; Review OpenStack OSSA-2021-005 and vendor distribution guidance..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-40085 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
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/1939733CVE reference · x_refsource_MISC
- https://security.openstack.org/ossa/OSSA-2021-005.htmlCVE reference · x_refsource_MISC
- [debian-lts-announce] 20211011 [SECURITY] [DLA 2781-1] neutron security updateCVE reference · mailing-list, x_refsource_MLIST
- DSA-4983CVE reference · vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20220526 [SECURITY] [DLA 3027-1] neutron security updateCVE reference · mailing-list, x_refsource_MLIST
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.