{"cve":"CVE-2021-38598","nvd":{"published":"2021-08-23T05:15:08.193","modified":"2026-06-17T04:02:25.337","status":"Modified","description":"OpenStack 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. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","score":9.1},"cwes":["CWE-290"],"references":["https://launchpad.net/bugs/1938670","https://launchpad.net/bugs/1938670"],"products":["openstack:neutron"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-38598","score":0.0122,"percentile":0.68693,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-hvm4-mc7m-22w4","url":"https://osv.dev/vulnerability/GHSA-hvm4-mc7m-22w4","summary":"OpenStack Neutron vulnerable to hardware address impersonation","modified":"2024-10-03T21:33:12.369038Z","packages":[{"ecosystem":"PyPI","name":"neutron","purl":"pkg:pypi/neutron","ranges":["<16.4.1"],"fixed":["16.4.1"]},{"ecosystem":"PyPI","name":"neutron","purl":"pkg:pypi/neutron","ranges":[">=17.0.0 <17.1.3"],"fixed":["17.1.3"]},{"ecosystem":"PyPI","name":"neutron","purl":"pkg:pypi/neutron","ranges":["18.0.0"],"fixed":[]}]},{"id":"PYSEC-2021-360","url":"https://osv.dev/vulnerability/PYSEC-2021-360","summary":"","modified":"2026-06-10T17:02:23.748026526Z","packages":[{"ecosystem":"PyPI","name":"neutron","purl":"pkg:pypi/neutron","ranges":["<16.4.1",">=17.0.0 <17.1.3",">=18.0.0 <18.1.0"],"fixed":["16.4.1","17.1.3","18.1.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}