{
  "fix": "firefox 86.0\u002Bbuild3-0ubuntu0.18.04.1",
  "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-86.0-build3-0ubuntu0.18.04.1",
  "summary": "firefox 86.0\u002Bbuild3-0ubuntu0.18.04.1, released February 26, 2021, fixes 10 CVEs in firefox. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.",
  "platform": "linux",
  "type": "package",
  "title": "firefox 86.0\u002Bbuild3-0ubuntu0.18.04.1 for Ubuntu 18.04.6 LTS (bionic)",
  "released": "2021-02-26T08:15:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2021-23978, rated Critical",
  "supported": false,
  "cveCount": 10,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.0153,
  "maxCvss": 8.8,
  "appliesTo": [
    {
      "product": "firefox",
      "productUrl": "https://patchblox.com/security/product/linux/firefox",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "86.0\u002Bbuild3-0ubuntu0.18.04.1",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-23978",
      "url": "https://patchblox.com/security/cve/CVE-2021-23978",
      "title": "Firefox ESR and 2 others: Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7.",
      "priority": "Urgent",
      "severity": "CRITICAL",
      "cvss": 8.8,
      "epss": 0.0153,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23973",
      "url": "https://patchblox.com/security/cve/CVE-2021-23973",
      "title": "Firefox ESR and 2 others: When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted,\u2026",
      "priority": "Urgent",
      "severity": "CRITICAL",
      "cvss": 6.5,
      "epss": 0.01368,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23968",
      "url": "https://patchblox.com/security/cve/CVE-2021-23968",
      "title": "Firefox ESR and 2 others: If Content Security Policy blocked frame navigation, the full destination of a redirect served in the\u2026",
      "priority": "Urgent",
      "severity": "CRITICAL",
      "cvss": 4.3,
      "epss": 0.01307,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23969",
      "url": "https://patchblox.com/security/cve/CVE-2021-23969",
      "title": "Firefox ESR and 2 others: As specified in the W3C Content Security Policy draft, when creating a violation report, \u0022User agents\u2026",
      "priority": "Urgent",
      "severity": "CRITICAL",
      "cvss": 4.3,
      "epss": 0.01212,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23972",
      "url": "https://patchblox.com/security/cve/CVE-2021-23972",
      "title": "Firefox ESR and 1 other: One phishing tactic on the web is to provide a link with HTTP Auth.",
      "priority": "High",
      "severity": "Low",
      "cvss": 8.8,
      "epss": 0.01013,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23979",
      "url": "https://patchblox.com/security/cve/CVE-2021-23979",
      "title": "Firefox ESR and 1 other: Mozilla developers reported memory safety bugs present in Firefox 85.",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.00925,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23975",
      "url": "https://patchblox.com/security/cve/CVE-2021-23975",
      "title": "Firefox ESR and 1 other: The developer page about:memory has a Measure function for exploring what object types the browser has\u2026",
      "priority": "Routine",
      "severity": "Low",
      "cvss": 6.5,
      "epss": 0.01012,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23970",
      "url": "https://patchblox.com/security/cve/CVE-2021-23970",
      "title": "Firefox ESR and 1 other: Context-specific code was included in a shared jump table; resulting in assertions being triggered in\u2026",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.5,
      "epss": 0.01007,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23971",
      "url": "https://patchblox.com/security/cve/CVE-2021-23971",
      "title": "Firefox ESR and 1 other: When processing a redirect with a conflicting Referrer-Policy, Firefox would have adopted the redirect\u0027s\u2026",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.5,
      "epss": 0.01007,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23974",
      "url": "https://patchblox.com/security/cve/CVE-2021-23974",
      "title": "Firefox ESR and 1 other: The DOMParser API did not properly process \u0027\u003Cnoscript\u003E\u0027 elements for escaping.",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.1,
      "epss": 0.00753,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-12T07:53:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}