{"answers":{"affected":"7 open source packages ship an affected version, including neutron. It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-20267 in the wild and no public exploit code.","fix":"Upgrade neutron to a fixed version for your release line: 15.3.3, 16.3.1 or 17.1.1.","what":"CVE-2021-20267 is a high-severity vulnerability in openstack-neutron, published on 28 May 2021. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-20267 and fix it if it is affected.\n\nWhat it is: CVE-2021-20267 is a high-severity vulnerability in openstack-neutron, published on 28 May 2021. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-20267 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- neutron (PyPI): affected all versions; fixed in 15.3.3, 16.3.1, 17.1.1\n- neutron (PyPI): affected all versions; fixed in 15.3.3\n- neutron (PyPI): affected all versions; fixed in 15.3.3\n- neutron (PyPI): affected from 16.0.0; fixed in 16.3.1\n- neutron (PyPI): affected from 16.0.0; fixed in 16.3.1\n- neutron (PyPI): affected from 17.0.0; fixed in 17.1.1\n- neutron (PyPI): affected from 17.0.0; fixed in 17.1.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-20267/ (Markdown: https://insights.sbomify.com/CVE-2021-20267/index.md)","id":"CVE-2021-20267","markdown":"https://insights.sbomify.com/CVE-2021-20267/index.md","name":"CVE-2021-20267","record":{"aliases":["DEBIAN-CVE-2021-20267","GHSA-w8hx-f868-pvch","PYSEC-2021-136","UBUNTU-CVE-2021-20267"],"analysis":{"component_type":"cloud_service","fix_type":"upgrade","impacts":["denial_of_service","data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"OpenStack Neutron","requires_auth":"low_privilege","summary":"Attackers can impersonate IPv6 addresses via crafted packets in Open vSwitch deployments, causing denial of service or traffic interception.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"neutron","vendor":"openstack"},{"product":"openstack_platform","vendor":"redhat"}],"cvss":{"score":7.1,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity"}],"description":"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.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Openstack Neutron has Insufficient Verification of IPv6 addresses","id":"CVE-2021-20267","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"security_feature_bypass","year":"2021"},"n_packages":7,"n_references":2,"next":{"headline":"Integer overflow in kernel","id":"CVE-2021-20268"},"packages":[{"ecosystem":"PyPI","fixed":["15.3.3","16.3.1","17.1.1"],"introduced":["0","16.0.0","17.0.0"],"last_affected":[],"package":"neutron","purl":"pkg:pypi/neutron","source":"PYSEC-2021-136"},{"ecosystem":"PyPI","fixed":["15.3.3"],"introduced":["0"],"last_affected":[],"package":"neutron","purl":null,"source":"GHSA-w8hx-f868-pvch"},{"ecosystem":"PyPI","fixed":["15.3.3"],"introduced":["0"],"last_affected":[],"package":"neutron","purl":"pkg:pypi/neutron","source":"GHSA-w8hx-f868-pvch"},{"ecosystem":"PyPI","fixed":["16.3.1"],"introduced":["16.0.0"],"last_affected":[],"package":"neutron","purl":null,"source":"GHSA-w8hx-f868-pvch"},{"ecosystem":"PyPI","fixed":["16.3.1"],"introduced":["16.0.0"],"last_affected":[],"package":"neutron","purl":"pkg:pypi/neutron","source":"GHSA-w8hx-f868-pvch"},{"ecosystem":"PyPI","fixed":["17.1.1"],"introduced":["17.0.0"],"last_affected":[],"package":"neutron","purl":null,"source":"GHSA-w8hx-f868-pvch"},{"ecosystem":"PyPI","fixed":["17.1.1"],"introduced":["17.0.0"],"last_affected":[],"package":"neutron","purl":"pkg:pypi/neutron","source":"GHSA-w8hx-f868-pvch"}],"prev":{"headline":"Denial of service in rpm","id":"CVE-2021-20266"},"products":["openstack-neutron"],"published":"2021-05-28","related":[{"cvss_score":9.1,"headline":"OpenStack Neutron vulnerable to hardware address impersonation","id":"CVE-2021-38598","kev_date_added":null,"published":"2021-08-23"},{"cvss_score":9.1,"headline":"OpenStack Neutron allows remote attackers to bypass an intended ICMPv6-spoofing protection mechanism","id":"CVE-2015-8914","kev_date_added":null,"published":"2016-06-17"},{"cvss_score":8.2,"headline":"OpenStack Neutron allows remote attackers to bypass an intended DHCP-spoofing protection mechanism","id":"CVE-2016-5362","kev_date_added":null,"published":"2016-06-17"},{"cvss_score":8.2,"headline":"OpenStack Neutron Intended MAC-spoofing protection mechanism bypass","id":"CVE-2016-5363","kev_date_added":null,"published":"2016-06-17"},{"cvss_score":7.6,"headline":"Privilege escalation in n/a","id":"CVE-2014-3632","kev_date_added":null,"published":"2014-10-07"},{"cvss_score":6.5,"headline":"openstack-neutron uncontrolled resource consumption flaw","id":"CVE-2022-3277","kev_date_added":null,"published":"2023-03-06"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["n/a"]},"summary":"Attackers can impersonate IPv6 addresses via crafted packets in Open vSwitch deployments, causing denial of service or traffic interception.","url":"https://insights.sbomify.com/CVE-2021-20267/"}