Security advisory

{
  "id": "5079b1edd4afa8698205d76bce93ff2fc7c2030d1f1ecabcb0d562cc1bed77ed",
  "url": "https://osv.dev/vulnerability/CVE-2023-51765",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2023-51765",
    "summary": "sendmail through 8.17.2 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because sendmail supports . but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.",
    "evidence": "osv:CVE-2023-51765",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-51765",
      "aliases": [
        "CVE-2023-51765"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/freebsd/freebsd-src",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "671fb7df97631020c42ce55527dc49fffe0656b7"
                },
                {
                  "introduced": "a4d3b78df842614c46b116fc5a6f470be637dccd"
                },
                {
                  "fixed": "5dd76dd0cc19450133aa379ce0ce4a68ae07fb39"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "11.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0"
                      },
                      {
                        "last_affected": "8.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "9.0"
                      },
                      {
                        "last_affected": "9.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5dd76dd0cc19450133aa379ce0ce4a68ae07fb39"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "8.0",
            "9.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-51765.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.500119082Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/security/cve/CVE-2023-51765",
        "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html",
        "https://lwn.net/Articles/956533/",
        "https://www.openwall.com/lists/oss-security/2023/12/21/7",
        "https://www.openwall.com/lists/oss-security/2023/12/22/7",
        "https://www.youtube.com/watch?v=V8KPV96g1To",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/51xxx/CVE-2023-51765.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-51765",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2255869",
        "https://bugzilla.suse.com/show_bug.cgi?id=1218351",
        "https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc",
        "https://lists.debian.org/debian-lts-announce/2024/06/msg00004.html",
        "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "8.17.2"
                  },
                  {
                    "fixed": "8.18"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/51xxx/CVE-2023-51765.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-51765",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 498484,
  "published_at": "2023-12-24T00:00:00+00:00"
}