Security advisory

{
  "id": "2696023e700603a8cf11de99c36bf9fc9ab771df6cffc4967b3db3b9e841901c",
  "url": "https://osv.dev/vulnerability/CVE-2021-38598",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-38598",
    "summary": "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.",
    "evidence": "osv:CVE-2021-38598",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-38598",
      "aliases": [
        "CVE-2021-38598",
        "GHSA-hvm4-mc7m-22w4",
        "PYSEC-2021-360"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openstack/neutron",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6a761dc42da99625bb18b4aabf4e2b340396c78c"
                },
                {
                  "introduced": "5858f6c5023121ea645c832ab87f078f0249adeb"
                },
                {
                  "last_affected": "5858f6c5023121ea645c832ab87f078f0249adeb"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "16.4.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:openstack:neutron:18.0.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "18.0.0"
                      },
                      {
                        "last_affected": "18.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "18.0.0",
            "16.4.0",
            "16.3.2",
            "18.0.0.0rc2",
            "16.3.1",
            "16.3.0",
            "16.2.0",
            "16.1.0",
            "16.0.0.0rc2",
            "16.0.0",
            "16.0.0.0rc1",
            "16.0.0.0b1",
            "15.0.0.0b1",
            "15.0.0.0rc1",
            "14.0.0.0b2",
            "14.0.0.0rc1",
            "14.0.0",
            "14.0.0.0b3",
            "14.0.0.0b1",
            "13.0.0.0rc1",
            "13.0.0.0b3",
            "13.0.0.0b2",
            "13.0.0.0b1",
            "12.0.0.0rc1",
            "12.0.0.0b3",
            "12.0.0.0b2",
            "12.0.0.0b1",
            "11.0.0.0rc1",
            "11.0.0.0b3",
            "11.0.0.0b2",
            "11.0.0.0b1",
            "10.0.0.0b3",
            "10.0.0.0rc1",
            "10.0.0.0b2",
            "10.0.0.0b1",
            "9.0.0.0b3",
            "9.0.0.0rc1",
            "9.0.0.0b2",
            "9.0.0.0b1",
            "8.0.0.0rc1",
            "8.0.0.0b3",
            "8.0.0.0b2",
            "8.0.0.0b1",
            "7.0.0.0b3",
            "7.0.0.0b2",
            "7.0.0.0b1",
            "7.0.0a0",
            "2015.1.0rc1",
            "2015.1.0b3",
            "2015.1.0b2",
            "2015.1.0b1",
            "2014.2.b2",
            "2014.2.rc1",
            "2014.2.b3",
            "2014.2.b1",
            "2014.1.rc1",
            "2014.1.b3",
            "2014.1.b2",
            "2014.1.b1",
            "2013.2.rc1",
            "2013.2.b2",
            "2013.1.g3",
            "grizzly-1",
            "folsom-3",
            "folsom-1",
            "essex-3",
            "essex-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38598.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:40.231266174Z",
      "provider": "osv",
      "references": [
        "https://launchpad.net/bugs/1938670"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "openstack:neutron",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "17.0.0"
                  },
                  {
                    "fixed": "17.1.3"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-38598",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 434868,
  "published_at": "2021-08-23T05:15:08.193+00:00"
}