{
  "cveId": "CVE-2021-3603",
  "url": "https://patchblox.com/security/cve/CVE-2021-3603",
  "summary": "CVE-2021-3603 is fixed in libphp-phpmailer on 1 platform, first by libphp-phpmailer 6.0.6-0.1ubuntu0.1~esm1, released June 17, 2021. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libphp-phpmailer: PHPMailer 6.4.1 and earlier contain a vulnerability that can result in untrusted code being called (if such code is i...",
  "description": "PHPMailer 6.4.1 and earlier contain a vulnerability that can result in untrusted code being called (if such code is injected into the host project\u0027s scope by other means). If the $patternselect parameter to validateAddress() is set to \u0027php\u0027 (the default, defined by PHPMailer::$validator), and the global namespace contains a function called php, it will be called in preference to the built-in validator of the same name. Mitigated in PHPMailer 6.5.0 by denying the use of simple strings as validator function names.",
  "published": "2021-06-17T05:15:00Z",
  "severity": "Medium",
  "epss": 0.0226,
  "epssPercentile": 0.83083,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libphp-phpmailer",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "6.0.6-0.1ubuntu0.1~esm1",
      "fix": "libphp-phpmailer 6.0.6-0.1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libphp-phpmailer-6.0.6-0.1ubuntu0.1-esm1",
      "released": "2021-06-17T05:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libphp-phpmailer",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "6.2.0-2ubuntu0.1~esm1",
      "fix": "libphp-phpmailer 6.2.0-2ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libphp-phpmailer-6.2.0-2ubuntu0.1-esm1",
      "released": "2021-06-17T05:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}