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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":"0.00126","scoring_system":"epss","scoring_elements":"0.31472","published_at":"2026-06-04T12:55:00Z"}],"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://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.org/ossa/OSSA-2021-001.html","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://security.openstack.org/ossa/OSSA-2021-001.html"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=985104","reference_id":"985104","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=985104"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/22137?format=json","purl":"pkg:pypi/neutron@15.3.3","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-1444-3h31-3kdv"},{"vulnerability":"VCID-69mn-brsx-xydy"},{"vulnerability":"VCID-p6g8-396q-t7ck"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/neutron@15.3.3"},{"url":"http://public2.vulnerablecode.io/api/packages/22138?format=json","purl":"pkg:pypi/neutron@16.3.1","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-1444-3h31-3kdv"},{"vulnerability":"VCID-69mn-brsx-xydy"},{"vulnerability":"VCID-p6g8-396q-t7ck"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/neutron@16.3.1"},{"url":"http://public2.vulnerablecode.io/api/packages/22139?format=json","purl":"pkg:pypi/neutron@17.1.1","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-1444-3h31-3kdv"},{"vulnerability":"VCID-69mn-brsx-xydy"},{"vulnerability":"VCID-p6g8-396q-t7ck"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/neutron@17.1.1"}],"aliases":["CVE-2021-20267","GHSA-w8hx-f868-pvch","PYSEC-2021-136"],"risk_score":4.0,"exploitability":"0.5","weighted_severity":"8.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-wa91-gzx6-h7gu"}],"fixing_vulnerabilities":[],"risk_score":"4.1","resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/neutron@15.0.0.0rc1"}