{
  "cveId": "CVE-2023-51765",
  "url": "https://patchblox.com/security/cve/CVE-2023-51765",
  "summary": "CVE-2023-51765 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2023-51765, released December 24, 2023. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "sendmail: sendmail through 8.17.2 allows SMTP smuggling in certain configurations",
  "description": "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 \u003CLF\u003E.\u003CCR\u003E\u003CLF\u003E but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with \u0027o\u0027 in srv_features.",
  "published": "2023-12-24T06:15:07Z",
  "severity": "medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "epss": 0.01082,
  "epssPercentile": 0.6539,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "sendmail",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "8.17.1.9-2\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2023-51765",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-51765",
      "released": "2023-12-24T06:15:07Z"
    },
    {
      "platform": "linux",
      "product": "sendmail",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "8.18.1-1",
      "fix": "DEBIAN-CVE-2023-51765",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-51765",
      "released": "2023-12-24T06:15:07Z"
    },
    {
      "platform": "linux",
      "product": "sendmail",
      "release": "Debian 14",
      "fixedVersion": "8.18.1-1",
      "fix": "DEBIAN-CVE-2023-51765",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-51765",
      "released": "2023-12-24T06:15:07Z"
    },
    {
      "platform": "linux",
      "product": "sendmail",
      "release": "amzn 2023",
      "fixedVersion": "8.18.2-2.amzn2023.0.1",
      "fix": "ALAS2023-2026-1818",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1818",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sendmail-cf",
      "release": "amzn 2023",
      "fixedVersion": "8.18.2-2.amzn2023.0.1",
      "fix": "ALAS2023-2026-1818",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1818",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sendmail-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "8.18.2-2.amzn2023.0.1",
      "fix": "ALAS2023-2026-1818",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1818",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sendmail-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "8.18.2-2.amzn2023.0.1",
      "fix": "ALAS2023-2026-1818",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1818",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sendmail-doc",
      "release": "amzn 2023",
      "fixedVersion": "8.18.2-2.amzn2023.0.1",
      "fix": "ALAS2023-2026-1818",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1818",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sendmail-milter",
      "release": "amzn 2023",
      "fixedVersion": "8.18.2-2.amzn2023.0.1",
      "fix": "ALAS2023-2026-1818",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1818",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sendmail-milter-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "8.18.2-2.amzn2023.0.1",
      "fix": "ALAS2023-2026-1818",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1818",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sendmail-milter-devel",
      "release": "amzn 2023",
      "fixedVersion": "8.18.2-2.amzn2023.0.1",
      "fix": "ALAS2023-2026-1818",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1818",
      "released": "2026-06-08T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}