{
  "fix": "RHSA-2021:5013",
  "url": "https://patchblox.com/security/fix/linux/rhsa-2021-5013",
  "summary": "RHSA-2021:5013, released December 8, 2021, fixes 10 CVEs in firefox (version 0:91.4.0-1.el8_5). None of them is reported as exploited. Patch Radar priority: High.",
  "platform": "linux",
  "type": "advisory",
  "title": "firefox security update",
  "released": "2021-12-08T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2021-43537, high severity",
  "supported": true,
  "cveCount": 10,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.02172,
  "maxCvss": 9.8,
  "vendorAdvisory": "https://access.redhat.com/errata/RHSA-2021:5013",
  "appliesTo": [
    {
      "product": "firefox",
      "productUrl": "https://patchblox.com/security/product/linux/firefox",
      "release": "RHEL 8",
      "fixedVersion": "0:91.4.0-1.el8_5",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-43537",
      "url": "https://patchblox.com/security/cve/CVE-2021-43537",
      "title": "Mozilla Firefox ESR and 3 others: An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.02172,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-43542",
      "url": "https://patchblox.com/security/cve/CVE-2021-43542",
      "title": "Mozilla Firefox ESR and 3 others: Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.01834,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-43536",
      "url": "https://patchblox.com/security/cve/CVE-2021-43536",
      "title": "Mozilla Firefox ESR and 3 others: Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.01811,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-43539",
      "url": "https://patchblox.com/security/cve/CVE-2021-43539",
      "title": "Mozilla Firefox ESR and 3 others: Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.01734,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-43545",
      "url": "https://patchblox.com/security/cve/CVE-2021-43545",
      "title": "Mozilla Firefox ESR and 3 others: Using the Location API in a loop could have caused severe application hangs and crashes.",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.01717,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-43541",
      "url": "https://patchblox.com/security/cve/CVE-2021-43541",
      "title": "Mozilla Firefox ESR and 3 others: When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.01694,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-43546",
      "url": "https://patchblox.com/security/cve/CVE-2021-43546",
      "title": "Mozilla Firefox ESR and 3 others: It was possible to recreate previous cursor spoofing attacks against users with a zoomed native cursor.",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.01505,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-43543",
      "url": "https://patchblox.com/security/cve/CVE-2021-43543",
      "title": "Mozilla Firefox ESR and 3 others: Documents loaded with the CSP sandbox directive could have escaped the sandbox\u0027s script restriction by\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.01454,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-43538",
      "url": "https://patchblox.com/security/cve/CVE-2021-43538",
      "title": "Mozilla Firefox ESR and 3 others: By misusing a race in our notification code, an attacker could have forcefully hidden the notification\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.01245,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-4129",
      "url": "https://patchblox.com/security/cve/CVE-2021-4129",
      "title": "Mozilla Firefox ESR and 3 others: Out-of-bounds Write",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.01062,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T12:40:37Z"
}