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Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. 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"url":"https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2021-360.yaml"},{"reference_url":"https://launchpad.net/bugs/1938670","reference_id":"","reference_type":"","scores":[{"value":"9.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"value":"8.8","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://launchpad.net/bugs/1938670"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38598","reference_id":"","reference_type":"","scores":[{"value":"9.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"value":"8.8","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38598"},{"reference_url":"https://opendev.org/openstack/neutron/commit/fafa5dacd5057120562184a734e7345e7c0e9639","reference_id":"","reference_type":"","scores":[{"value":"9.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"value":"8.8","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://opendev.org/openstack/neutron/commit/fafa5dacd5057120562184a734e7345e7c0e9639"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1995273","reference_id":"1995273","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1995273"},{"reference_url":"https://github.com/advisories/GHSA-hvm4-mc7m-22w4","reference_id":"GHSA-hvm4-mc7m-22w4","reference_type":"","scores":[{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-hvm4-mc7m-22w4"},{"reference_url":"https://usn.ubuntu.com/6067-1/","reference_id":"USN-6067-1","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/6067-1/"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/1056828?format=json","purl":"pkg:deb/debian/neutron@2:17.2.1-0%2Bdeb11u1","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-qua4-h1r7-a7b7"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/neutron@2:17.2.1-0%252Bdeb11u1"}],"aliases":["CVE-2021-38598","GHSA-hvm4-mc7m-22w4","PYSEC-2021-360"],"risk_score":4.1,"exploitability":"0.5","weighted_severity":"8.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-f9bx-xknx-6qbv"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/6462?format=json","vulnerability_id":"VCID-sh88-99pv-aqac","summary":"A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20267.json","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20267.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-20267","reference_id":"","reference_type":"","scores":[{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31049","published_at":"2026-05-07T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31521","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31658","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31702","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.3152","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31573","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31603","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31608","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31565","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31528","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31562","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.3154","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31507","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31333","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31206","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.31127","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00123","scoring_system":"epss","scoring_elements":"0.30979","published_at":"2026-05-05T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-20267"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1934330","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H"},{"value":"7.1","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1934330"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20267","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20267"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/openstack/neutron","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H"},{"value":"7.1","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/openstack/neutron"},{"reference_url":"https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2021-136.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H"},{"value":"7.1","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2021-136.yaml"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20267","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H"},{"value":"7.1","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20267"},{"reference_url":"https://security.openstack.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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.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-40085.json","reference_id":"","reference_type":"","scores":[{"value":"7.6","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-40085.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-40085","reference_id":"","reference_type":"","scores":[{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61447","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61496","published_at":"2026-05-07T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61501","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61511","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61504","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61483","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61468","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61421","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.6145","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61422","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61346","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61485","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61498","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61515","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61471","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00412","scoring_system":"epss","scoring_elements":"0.61491","published_at":"2026-04-12T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-40085"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40085","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40085"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/openstack/neutron","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"value":"7.1","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/openstack/neutron"},{"reference_url":"https://github.com/openstack/neutron/commit/df891f0593d234e01f27d7c0376d9702e178ecfb","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"value":"7.1","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/openstack/neutron/commit/df891f0593d234e01f27d7c0376d9702e178ecfb"},{"reference_url":"https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2021-361.yaml","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"value":"7.1","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2021-361.yaml"},{"reference_url":"https://launchpad.net/bugs/1939733","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"value":"7.1","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://launchpad.net/bugs/1939733"},{"reference_url":"https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html","reference_id":"","reference_type"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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 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