{
  "cveId": "CVE-2018-12395",
  "url": "https://patchblox.com/security/cve/CVE-2018-12395",
  "summary": "CVE-2018-12395 is fixed in 4 products on 1 platform, first by firefox 63.0\u002Bbuild2-0ubuntu0.18.04.2, released October 23, 2018. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "firefox: By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions throug...",
  "description": "By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. This vulnerability affects Firefox ESR \u0026lt; 60.3 and Firefox \u0026lt; 63.",
  "published": "2018-10-23T17:00:00Z",
  "severity": "Medium",
  "epss": 0.02851,
  "epssPercentile": 0.86798,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "firefox",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "63.0\u002Bbuild2-0ubuntu0.18.04.2",
      "fix": "firefox 63.0\u002Bbuild2-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-63.0-build2-0ubuntu0.18.04.2",
      "released": "2018-10-23T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox-globalmenu",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "63.0\u002Bbuild2-0ubuntu0.18.04.2",
      "fix": "firefox-globalmenu 63.0\u002Bbuild2-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-globalmenu-63.0-build2-0ubuntu0.18.04.2",
      "released": "2018-10-23T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox-mozsymbols",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "63.0\u002Bbuild2-0ubuntu0.18.04.2",
      "fix": "firefox-mozsymbols 63.0\u002Bbuild2-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-mozsymbols-63.0-build2-0ubuntu0.18.04.2",
      "released": "2018-10-23T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox-testsuite",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "63.0\u002Bbuild2-0ubuntu0.18.04.2",
      "fix": "firefox-testsuite 63.0\u002Bbuild2-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-testsuite-63.0-build2-0ubuntu0.18.04.2",
      "released": "2018-10-23T17:00:00Z"
    }
  ],
  "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"
  }
}