{
  "fix": "RHSA-2021:0298",
  "url": "https://patchblox.com/security/fix/linux/rhsa-2021-0298",
  "summary": "RHSA-2021:0298, released January 28, 2021, fixes 6 CVEs in thunderbird (version 0:78.7.0-1.el8_3). None of them is reported as exploited. Patch Radar priority: High.",
  "platform": "linux",
  "type": "advisory",
  "title": "thunderbird security update",
  "released": "2021-01-28T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2021-23964, high severity",
  "supported": true,
  "cveCount": 6,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.01639,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://access.redhat.com/errata/RHSA-2021:0298",
  "appliesTo": [
    {
      "product": "thunderbird",
      "productUrl": "https://patchblox.com/security/product/linux/thunderbird",
      "release": "RHEL 8",
      "fixedVersion": "0:78.7.0-1.el8_3",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-23964",
      "url": "https://patchblox.com/security/cve/CVE-2021-23964",
      "title": "Firefox ESR and 2 others: Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78.6.",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.01361,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23960",
      "url": "https://patchblox.com/security/cve/CVE-2021-23960",
      "title": "Firefox ESR and 2 others: Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.01289,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23954",
      "url": "https://patchblox.com/security/cve/CVE-2021-23954",
      "title": "Firefox ESR and 2 others: Using the new logical assignment operators in a JavaScript switch statement could have caused a type\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.01186,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-15685",
      "url": "https://patchblox.com/security/cve/CVE-2020-15685",
      "title": "Thunderbird: Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00881,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-26976",
      "url": "https://patchblox.com/security/cve/CVE-2020-26976",
      "title": "Firefox ESR and 1 other: When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former,\u2026",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01639,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23953",
      "url": "https://patchblox.com/security/cve/CVE-2021-23953",
      "title": "Firefox ESR and 2 others: If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin\u2026",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 4.3,
      "epss": 0.01056,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T18:46:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}