{
  "cveId": "CVE-2019-17023",
  "url": "https://patchblox.com/security/cve/CVE-2019-17023",
  "summary": "CVE-2019-17023 is fixed in 18 products on 2 platforms, first by firefox 72.0.1\u002Bbuild1-0ubuntu0.18.04.1, released January 8, 2020. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Firefox ESR: After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting\u2026",
  "description": "After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored. This vulnerability affects Firefox \u003C 72.",
  "published": "2020-01-08T14:15:00Z",
  "severity": "Moderate",
  "cvss": 6.5,
  "epss": 0.0134,
  "epssPercentile": 0.71438,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2019-17023",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Mozilla Firefox ESR (en-US)",
      "fixedVersion": "78.0esr",
      "fix": "Mozilla Firefox ESR (en-US) 78.0esr",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr-78.0esr",
      "released": "2020-06-25T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "72.0.1\u002Bbuild1-0ubuntu0.18.04.1",
      "fix": "firefox 72.0.1\u002Bbuild1-0ubuntu0.18.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-72.0.1-build1-0ubuntu0.18.04.1",
      "released": "2020-01-08T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "72.0.1\u002Bbuild1-0ubuntu1",
      "fix": "firefox 72.0.1\u002Bbuild1-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-firefox-72.0.1-build1-0ubuntu1",
      "released": "2020-01-08T16:00:00Z"
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    {
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      "product": "firefox-geckodriver",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "72.0.1\u002Bbuild1-0ubuntu0.18.04.1",
      "fix": "firefox-geckodriver 72.0.1\u002Bbuild1-0ubuntu0.18.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-geckodriver-72.0.1-build1-0ubuntu0.18.04.1",
      "released": "2020-01-08T16:00:00Z"
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    {
      "platform": "linux",
      "product": "firefox-geckodriver",
      "release": "Ubuntu 20.04 LTS (focal)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-firefox-geckodriver-72.0.1-build1-0ubuntu1",
      "released": "2020-01-08T16:00:00Z"
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      "platform": "linux",
      "product": "firefox-mozsymbols",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "72.0.1\u002Bbuild1-0ubuntu0.18.04.1",
      "fix": "firefox-mozsymbols 72.0.1\u002Bbuild1-0ubuntu0.18.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-mozsymbols-72.0.1-build1-0ubuntu0.18.04.1",
      "released": "2020-01-08T16:00:00Z"
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    {
      "platform": "linux",
      "product": "firefox-mozsymbols",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "72.0.1\u002Bbuild1-0ubuntu1",
      "fix": "firefox-mozsymbols 72.0.1\u002Bbuild1-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-firefox-mozsymbols-72.0.1-build1-0ubuntu1",
      "released": "2020-01-08T16:00:00Z"
    },
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      "platform": "linux",
      "product": "libnss3",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
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      "released": "2020-05-25T17:00:00Z"
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-07T12:40:37Z"
}