{
  "fix": "Mozilla Thunderbird (en-US) 78.1.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird-78.1.0",
  "summary": "Mozilla Thunderbird (en-US) 78.1.0, released July 29, 2020, fixes 8 CVEs in Mozilla Thunderbird (en-US). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Thunderbird (en-US) is 159.0, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Mozilla Thunderbird (en-US) 78.1.0",
  "released": "2020-07-29T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2020-15659, high severity",
  "supported": true,
  "cveCount": 8,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.02391,
  "maxCvss": 8.8,
  "appliesTo": [
    {
      "product": "Mozilla Thunderbird (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-thunderbird-en-us",
      "fixedVersion": "78.1.0",
      "latestVersion": "159.0",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Mozilla Thunderbird (en-US)",
    "latestVersion": "159.0",
    "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-thunderbird-en-us"
  },
  "cves": [
    {
      "cveId": "CVE-2020-15659",
      "url": "https://patchblox.com/security/cve/CVE-2020-15659",
      "title": "Firefox ESR and 2 others: Mozilla developers and community members reported memory safety bugs present in Firefox 78 and Firefox\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.02391,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-15656",
      "url": "https://patchblox.com/security/cve/CVE-2020-15656",
      "title": "Firefox ESR and 2 others: JIT optimizations involving the Javascript arguments object could confuse later optimizations.",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.01523,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-15657",
      "url": "https://patchblox.com/security/cve/CVE-2020-15657",
      "title": "Firefox ESR and 2 others: Firefox could be made to load attacker-supplied DLL files from the installation directory.",
      "priority": "High",
      "cvss": 7.8,
      "epss": 0.00353,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-15655",
      "url": "https://patchblox.com/security/cve/CVE-2020-15655",
      "title": "Firefox ESR and 2 others: A redirected HTTP request which is observed or modified through a web extension could bypass existing\u2026",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.5,
      "epss": 0.0152,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-15654",
      "url": "https://patchblox.com/security/cve/CVE-2020-15654",
      "title": "Firefox ESR and 2 others: When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user\u2026",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01423,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-15653",
      "url": "https://patchblox.com/security/cve/CVE-2020-15653",
      "title": "Firefox ESR and 2 others: An iframe sandbox element with the allow-popups flag could be bypassed when using noopener links.",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01397,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-15658",
      "url": "https://patchblox.com/security/cve/CVE-2020-15658",
      "title": "Firefox ESR and 2 others: The code for downloading files did not properly take care of special characters, which led to an attacker\u2026",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01388,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-15652",
      "url": "https://patchblox.com/security/cve/CVE-2020-15652",
      "title": "Firefox ESR and 2 others: By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result\u2026",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01263,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-10T13:56:55Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}