Security advisory

{
  "id": "5d4a2f76c8564f0b9c1419093ade5e742c18575f7990c609926801efbdeeb3d8",
  "url": "https://osv.dev/vulnerability/CVE-2021-31810",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-31810",
    "summary": "An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. A malicious FTP server can use the PASV response to trick Net::FTP into connecting back to a given IP address and port. This potentially makes curl extract information about services that are otherwise private and not disclosed (e.g., the attacker can conduct port scans and service banner extractions).",
    "evidence": "osv:CVE-2021-31810",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-31810",
      "aliases": [
        "BIT-ruby-2021-31810",
        "BIT-ruby-min-2021-31810",
        "CVE-2021-31810"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ruby/ruby",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "930143880a8b593e7444b94e2e0522b83a25c671"
                },
                {
                  "introduced": "647ee6f091eafcce70ffb75ddf7e121e192ab217"
                },
                {
                  "last_affected": "6847ee089d7655b2a0eea4fee3133aeacd4cc7cc"
                },
                {
                  "introduced": "95aff214687a5e12c3eb57d056665741e734c188"
                },
                {
                  "last_affected": "0fb782ee38ea37fd5fe8b1f775f8ad866a82a3f0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.6.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.7.0"
                      },
                      {
                        "last_affected": "2.7.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "last_affected": "3.0.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3_0_1",
            "v2_7_3",
            "v2_6_7",
            "v3_0_0",
            "v2_7_2",
            "v2_7_1",
            "v2_7_0",
            "v1_0_r2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-31810.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:24.974872008Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/",
        "https://lists.debian.org/debian-lts-announce/2021/10/msg00009.html",
        "https://security.gentoo.org/glsa/202401-27",
        "https://security.netapp.com/advisory/ntap-20210917-0001/",
        "https://www.ruby-lang.org/en/news/2021/07/07/trusting-pasv-responses-in-net-ftp/",
        "https://hackerone.com/reports/1145454",
        "https://www.oracle.com/security-alerts/cpuapr2022.html"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:oracle:jd_edwards_enterpriseone_tools:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:jd_edwards_enterpriseone_tools",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "9.2.6.1"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-31810",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 431266,
  "published_at": "2021-07-13T13:15:09.243+00:00"
}