Security advisory

{
  "id": "e8b5341ccf9c0901882bef7862ef0deb45e75c9b073e0a2d615ae12a714c4b10",
  "url": "https://osv.dev/vulnerability/CVE-2021-40085",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-40085",
    "summary": "An 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.",
    "evidence": "osv:CVE-2021-40085",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-40085",
      "aliases": [
        "CVE-2021-40085",
        "GHSA-fh73-gjvg-349c",
        "PYSEC-2021-361"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openstack/neutron",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6a761dc42da99625bb18b4aabf4e2b340396c78c"
                },
                {
                  "introduced": "f7282d909ed3f5834748995b00b70413f1b43495"
                },
                {
                  "fixed": "d961731a73128125ebf03fae52b4b34f3e7abf27"
                },
                {
                  "introduced": "5858f6c5023121ea645c832ab87f078f0249adeb"
                },
                {
                  "fixed": "c5e86f4f8f7e36233f383323e24e72dbe28efc04"
                }
              ],
              "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:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "17.0.0"
                      },
                      {
                        "fixed": "17.2.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "18.0.0"
                      },
                      {
                        "fixed": "18.1.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "18.1.0",
            "16.4.0",
            "17.2.0",
            "16.3.2",
            "17.1.2",
            "18.0.0.0rc2",
            "18.0.0",
            "17.1.1",
            "16.3.1",
            "17.1.0",
            "16.3.0",
            "17.0.0.0rc2",
            "17.0.0",
            "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-2021-40085.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:54.717774339Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html",
        "https://lists.debian.org/debian-lts-announce/2022/05/msg00038.html",
        "https://www.debian.org/security/2021/dsa-4983",
        "https://launchpad.net/bugs/1939733",
        "https://security.openstack.org/ossa/OSSA-2021-005.html"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
              "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  },
                  {
                    "introduced": "10.0"
                  },
                  {
                    "last_affected": "10.0"
                  },
                  {
                    "introduced": "11.0"
                  },
                  {
                    "last_affected": "11.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-40085",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 438267,
  "published_at": "2021-08-31T18:15:08.837+00:00"
}