{
  "fix": "Mozilla Firefox (en-US) 99.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox-99.0",
  "summary": "Mozilla Firefox (en-US) 99.0, released April 5, 2022, fixes 10 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Mozilla Firefox (en-US) 99.0",
  "released": "2022-04-05T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2022-28281, high severity",
  "supported": true,
  "cveCount": 10,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.02781,
  "maxCvss": 8.8,
  "appliesTo": [
    {
      "product": "Mozilla Firefox (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-firefox-en-us",
      "fixedVersion": "99.0",
      "latestVersion": "159.0",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Mozilla Firefox (en-US)",
    "latestVersion": "159.0",
    "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-firefox-en-us"
  },
  "cves": [
    {
      "cveId": "CVE-2022-28281",
      "url": "https://patchblox.com/security/cve/CVE-2022-28281",
      "title": "Mozilla Thunderbird and 4 others: Out-of-bounds Write",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.02781,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2022-28282",
      "url": "https://patchblox.com/security/cve/CVE-2022-28282",
      "title": "Mozilla Thunderbird and 4 others: Use After Free",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.0218,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2022-1097",
      "url": "https://patchblox.com/security/cve/CVE-2022-1097",
      "title": "Mozilla Thunderbird and 4 others: Use After Free",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00952,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2022-28285",
      "url": "https://patchblox.com/security/cve/CVE-2022-28285",
      "title": "Mozilla Thunderbird and 4 others: Out-of-bounds Read",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00789,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2022-28289",
      "url": "https://patchblox.com/security/cve/CVE-2022-28289",
      "title": "Mozilla Thunderbird and 4 others: Out-of-bounds Write",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00737,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2022-28284",
      "url": "https://patchblox.com/security/cve/CVE-2022-28284",
      "title": "Mozilla Firefox ESR and 2 others: Improper Encoding or Escaping of Output",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.00585,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2022-28286",
      "url": "https://patchblox.com/security/cve/CVE-2022-28286",
      "title": "Mozilla Thunderbird and 4 others: Improper Restriction of Rendered UI Layers or Frames",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00584,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2022-28288",
      "url": "https://patchblox.com/security/cve/CVE-2022-28288",
      "title": "Mozilla Firefox ESR and 2 others: Out-of-bounds Write",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.00556,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2022-28283",
      "url": "https://patchblox.com/security/cve/CVE-2022-28283",
      "title": "Mozilla Firefox ESR and 2 others: Files or Directories Accessible to External Parties",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.5,
      "epss": 0.006,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2022-28287",
      "url": "https://patchblox.com/security/cve/CVE-2022-28287",
      "title": "Mozilla Firefox ESR and 2 others: Improper Control of a Resource Through its Lifetime",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.5,
      "epss": 0.0057,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}