{
  "cveId": "CVE-2021-23988",
  "url": "https://patchblox.com/security/cve/CVE-2021-23988",
  "summary": "CVE-2021-23988 is fixed in 4 products on 2 platforms, first by firefox 87.0\u002Bbuild3-0ubuntu0.20.04.2, released March 24, 2021. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Firefox ESR and 1 other: Mozilla developers reported memory safety bugs present in Firefox 86.",
  "description": "Mozilla developers reported memory safety bugs present in Firefox 86. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox \u003C 87.",
  "published": "2021-03-24T17:00:00Z",
  "severity": "Medium",
  "cvss": 8.8,
  "epss": 0.01076,
  "epssPercentile": 0.65206,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2021-23988",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Mozilla Firefox ESR (en-US)",
      "fixedVersion": "91.0",
      "fix": "Mozilla Firefox ESR (en-US) 91.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr-91.0",
      "released": "2021-08-04T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "87.0\u002Bbuild3-0ubuntu0.18.04.2",
      "fix": "firefox 87.0\u002Bbuild3-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-87.0-build3-0ubuntu0.18.04.2",
      "released": "2021-06-24T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "87.0\u002Bbuild3-0ubuntu0.20.04.2",
      "fix": "firefox 87.0\u002Bbuild3-0ubuntu0.20.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-firefox-87.0-build3-0ubuntu0.20.04.2",
      "released": "2021-03-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox-geckodriver",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "87.0\u002Bbuild3-0ubuntu0.18.04.2",
      "fix": "firefox-geckodriver 87.0\u002Bbuild3-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-geckodriver-87.0-build3-0ubuntu0.18.04.2",
      "released": "2021-06-24T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox-geckodriver",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "87.0\u002Bbuild3-0ubuntu0.20.04.2",
      "fix": "firefox-geckodriver 87.0\u002Bbuild3-0ubuntu0.20.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-firefox-geckodriver-87.0-build3-0ubuntu0.20.04.2",
      "released": "2021-03-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox-mozsymbols",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "87.0\u002Bbuild3-0ubuntu0.18.04.2",
      "fix": "firefox-mozsymbols 87.0\u002Bbuild3-0ubuntu0.18.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-mozsymbols-87.0-build3-0ubuntu0.18.04.2",
      "released": "2021-06-24T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "firefox-mozsymbols",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "87.0\u002Bbuild3-0ubuntu0.20.04.2",
      "fix": "firefox-mozsymbols 87.0\u002Bbuild3-0ubuntu0.20.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-firefox-mozsymbols-87.0-build3-0ubuntu0.20.04.2",
      "released": "2021-03-24T17:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}