{
  "fix": "RHSA-2021:1353",
  "url": "https://patchblox.com/security/fix/linux/rhsa-2021-1353",
  "summary": "RHSA-2021:1353, released April 26, 2021, fixes 9 CVEs in thunderbird (version 0:78.10.0-1.el8_3). None of them is reported as exploited. Patch Radar priority: High.",
  "platform": "linux",
  "type": "advisory",
  "title": "thunderbird security update",
  "released": "2021-04-26T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2021-23994, high severity",
  "supported": true,
  "cveCount": 9,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.01756,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://access.redhat.com/errata/RHSA-2021:1353",
  "appliesTo": [
    {
      "product": "thunderbird",
      "productUrl": "https://patchblox.com/security/product/linux/thunderbird",
      "release": "RHEL 8",
      "fixedVersion": "0:78.10.0-1.el8_3",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-23994",
      "url": "https://patchblox.com/security/cve/CVE-2021-23994",
      "title": "Firefox ESR and 2 others: A WebGL framebuffer was not initialized early enough, resulting in memory corruption and an out of bound\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.01756,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23961",
      "url": "https://patchblox.com/security/cve/CVE-2021-23961",
      "title": "Firefox ESR and 1 other: Further techniques that built on the slipstream research combined with a malicious webpage could have\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.4,
      "epss": 0.01477,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23999",
      "url": "https://patchblox.com/security/cve/CVE-2021-23999",
      "title": "Firefox ESR and 2 others: If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.01372,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-29946",
      "url": "https://patchblox.com/security/cve/CVE-2021-29946",
      "title": "Firefox ESR and 2 others: Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.01303,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23995",
      "url": "https://patchblox.com/security/cve/CVE-2021-23995",
      "title": "Firefox ESR and 2 others: When Responsive Design Mode was enabled, it used references to objects that were previously freed.",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.01181,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-24002",
      "url": "https://patchblox.com/security/cve/CVE-2021-24002",
      "title": "Firefox ESR and 2 others: When a user clicked on an FTP URL containing encoded newline characters (%0A and %0D), the newlines would\u2026",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.01125,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-29945",
      "url": "https://patchblox.com/security/cve/CVE-2021-29945",
      "title": "Firefox ESR and 2 others: The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and\u2026",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01202,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-23998",
      "url": "https://patchblox.com/security/cve/CVE-2021-23998",
      "title": "Firefox ESR and 2 others: Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon\u2026",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.00594,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-29948",
      "url": "https://patchblox.com/security/cve/CVE-2021-29948",
      "title": "Thunderbird: Signatures are written to disk before and read during verification, which might be subject to a race\u2026",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 2.5,
      "epss": 0.00286,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T12:40:37Z"
}