{"api_version":"1","generated_at":"2026-04-23T11:35:02+00:00","cve":"CVE-2021-40085","urls":{"html":"https://cve.report/CVE-2021-40085","api":"https://cve.report/api/cve/CVE-2021-40085.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-40085","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-40085"},"summary":{"title":"CVE-2021-40085","description":"An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2021-08-31 18:15:00","updated_at":"2022-06-13 19:56:00"},"problem_types":["NVD-CWE-noinfo"],"metrics":[],"references":[{"url":"https://lists.debian.org/debian-lts-announce/2022/05/msg00038.html","name":"[debian-lts-announce] 20220526 [SECURITY] [DLA 3027-1] neutron security update","refsource":"MLIST","tags":[],"title":"[SECURITY] [DLA 3027-1] neutron security update","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://security.openstack.org/ossa/OSSA-2021-005.html","name":"https://security.openstack.org/ossa/OSSA-2021-005.html","refsource":"MISC","tags":[],"title":"OSSA-2021-005: Arbitrary dnsmasq reconfiguration via extra_dhcp_opts — OpenStack Security Advisories 0.0.1.dev241 documentation","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html","name":"[debian-lts-announce] 20211011 [SECURITY] [DLA 2781-1] neutron security update","refsource":"MLIST","tags":[],"title":"[SECURITY] [DLA 2781-1] neutron security update","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"http://www.openwall.com/lists/oss-security/2021/08/31/2","name":"[oss-security] 20210831 [OSSA-2021-005] Neutron: Arbitrary dnsmasq reconfiguration via extra_dhcp_opts (CVE-2021-40085)","refsource":"MLIST","tags":[],"title":"oss-security - [OSSA-2021-005] Neutron: Arbitrary dnsmasq reconfiguration via\n extra_dhcp_opts (CVE-2021-40085)","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://launchpad.net/bugs/1939733","name":"https://launchpad.net/bugs/1939733","refsource":"MISC","tags":[],"title":"Bug #1939733 “[OSSA-2021-005] Arbitrary dnsmasq reconfiguration ...” : Bugs : neutron","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.debian.org/security/2021/dsa-4983","name":"DSA-4983","refsource":"DEBIAN","tags":[],"title":"Debian -- Security Information -- DSA-4983-1 neutron","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-40085","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40085","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"40085","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"10.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"40085","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"11.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"40085","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"9.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"40085","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"openstack","cpe5":"neutron","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-40085","qid":"178820","title":"Debian Security Update for neutron (DSA 4983-1)"},{"cve":"CVE-2021-40085","qid":"178836","title":"Debian Security Update for neutron (DLA 2781-1)"},{"cve":"CVE-2021-40085","qid":"179321","title":"Debian Security Update for neutron (DLA 3027-1)"},{"cve":"CVE-2021-40085","qid":"182336","title":"Debian Security Update for neutron (CVE-2021-40085)"},{"cve":"CVE-2021-40085","qid":"199327","title":"Ubuntu Security Notification for OpenStack Neutron Vulnerabilities (USN-6067-1)"},{"cve":"CVE-2021-40085","qid":"239622","title":"Red Hat Update for Red Hat OpenStack Platform 13.0 (openstack-neutron) (RHSA-2021:3503)"},{"cve":"CVE-2021-40085","qid":"239623","title":"Red Hat Update for Red Hat OpenStack Platform 10.0 (openstack-neutron) (RHSA-2021:3502)"},{"cve":"CVE-2021-40085","qid":"239634","title":"Red Hat Update for Red Hat OpenStack Platform 16.1 (openstack-neutron) (RHSA-2021:3481)"},{"cve":"CVE-2021-40085","qid":"239640","title":"Red Hat Update for Red Hat OpenStack Platform 16.2 (openstack-neutron) (RHSA-2021:3488)"},{"cve":"CVE-2021-40085","qid":"997506","title":"Python (Pip) Security Update for neutron (GHSA-fh73-gjvg-349c)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2021-40085","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://launchpad.net/bugs/1939733","refsource":"MISC","name":"https://launchpad.net/bugs/1939733"},{"refsource":"MLIST","name":"[oss-security] 20210831 [OSSA-2021-005] Neutron: Arbitrary dnsmasq reconfiguration via extra_dhcp_opts (CVE-2021-40085)","url":"http://www.openwall.com/lists/oss-security/2021/08/31/2"},{"refsource":"MISC","name":"https://security.openstack.org/ossa/OSSA-2021-005.html","url":"https://security.openstack.org/ossa/OSSA-2021-005.html"},{"refsource":"MLIST","name":"[debian-lts-announce] 20211011 [SECURITY] [DLA 2781-1] neutron security update","url":"https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html"},{"refsource":"DEBIAN","name":"DSA-4983","url":"https://www.debian.org/security/2021/dsa-4983"},{"refsource":"MLIST","name":"[debian-lts-announce] 20220526 [SECURITY] [DLA 3027-1] neutron security update","url":"https://lists.debian.org/debian-lts-announce/2022/05/msg00038.html"}]}},"nvd":{"publishedDate":"2021-08-31 18:15:00","lastModifiedDate":"2022-06-13 19:56:00","problem_types":["NVD-CWE-noinfo"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:S/C:N/I:P/A:N","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"SINGLE","confidentialityImpact":"NONE","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":4},"severity":"MEDIUM","exploitabilityScore":8,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*","versionEndExcluding":"16.4.1","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*","versionStartIncluding":"18.0.0","versionEndExcluding":"18.1.1","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*","versionStartIncluding":"17.0.0","versionEndExcluding":"17.2.1","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"40085","Ordinal":"215792","Title":"CVE-2021-40085","CVE":"CVE-2021-40085","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"40085","Ordinal":"1","NoteData":"An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"40085","Ordinal":"2","NoteData":"2021-08-31","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"40085","Ordinal":"3","NoteData":"2021-10-11","Type":"Other","Title":"Modified"}]}}}