Security advisory

{
  "id": "c6656d4bd8042d09717884b6a6cd4f3d2006b6491976fed9b50c765eaf5d1556",
  "url": "https://osv.dev/vulnerability/CVE-2020-7247",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-7247",
    "summary": "smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell metacharacters in a MAIL FROM field. This affects the \"uncommented\" default configuration. The issue exists because of an incorrect return value upon failure of input validation.",
    "evidence": "osv:CVE-2020-7247",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-7247",
      "aliases": [
        "CVE-2020-7247"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openbsd/src",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "9dcfda045474d8903224d175907bfc29761dcb45"
                }
              ],
              "database_specific": {
                "source": "REFERENCES"
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-7247.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-7247-1439a3f1",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "146958479146620846539546414962359749417",
                    "145804354479718942648469601420943504881",
                    "50866359851508526042491977853727488282",
                    "207177037661277233987566775936640071114",
                    "256454692897472681432177734798303501079",
                    "333579557200389565105833963070610317524",
                    "151964549180595370813610698553145369373",
                    "164042760444352403035042736481382744972",
                    "157779360057984813910033772595342582972",
                    "128067893643618281774819757885083806704",
                    "92864325646592764248353712193035702172",
                    "80056390225257104560475256115545599826",
                    "33586722040586328695311359832171375475",
                    "116533349178807723563281035809734756036",
                    "319598776653868670885544067356391424772",
                    "134792771592966456779690561609829698813",
                    "43264858727266399511000037806169423068"
                  ]
                },
                "source": "https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45",
                "target": {
                  "file": "usr.sbin/smtpd/smtp_session.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-7247-ba7fc816",
                "digest": {
                  "length": 902,
                  "function_hash": "81829132623799367638487615930946742238"
                },
                "source": "https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45",
                "target": {
                  "file": "usr.sbin/smtpd/smtp_session.c",
                  "function": "smtp_mailaddr"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-09T13:05:23Z"
          }
        }
      ],
      "modified": "2026-10-09T13:05:23.511535028Z",
      "provider": "osv",
      "references": [
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-7247",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/",
        "https://seclists.org/bugtraq/2020/Jan/51",
        "https://usn.ubuntu.com/4268-1/",
        "https://www.debian.org/security/2020/dsa-4611",
        "https://www.kb.cert.org/vuls/id/390745",
        "https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45",
        "https://www.openbsd.org/security.html"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
              "cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*"
            ],
            "source": "CPE_STRING",
            "vendor_product": "canonical:ubuntu_linux",
            "extracted_events": [
              {
                "introduced": "18.04"
              },
              {
                "last_affected": "18.04"
              },
              {
                "introduced": "19.10"
              },
              {
                "last_affected": "19.10"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "source": "CPE_STRING",
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "introduced": "9.0"
              },
              {
                "last_affected": "9.0"
              },
              {
                "introduced": "10.0"
              },
              {
                "last_affected": "10.0"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"
            ],
            "source": "CPE_STRING",
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "introduced": "32"
              },
              {
                "last_affected": "32"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:openbsd:opensmtpd:6.6:*:*:*:*:*:*:*"
            ],
            "source": "CPE_STRING",
            "vendor_product": "openbsd:opensmtpd",
            "extracted_events": [
              {
                "introduced": "6.6"
              },
              {
                "last_affected": "6.6"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-7247",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 120930,
  "published_at": "2020-01-29T16:15:12.897+00:00"
}