{
  "cveId": "CVE-2021-23985",
  "url": "https://patchblox.com/security/cve/CVE-2021-23985",
  "summary": "CVE-2021-23985 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: Routine.",
  "title": "Firefox ESR and 1 other: If an attacker is able to alter specific about:config values (for example malware running on the user\u0027s\u2026",
  "description": "If an attacker is able to alter specific about:config values (for example malware running on the user\u0027s computer), the Devtools remote debugging feature could have been enabled in a way that was unnoticable to the user. This would have allowed a remote attacker (able to make a direct network connection to the victim) to monitor the user\u0027s browsing activity and (plaintext) network traffic. This was addressed by providing a visual cue when Devtools has an open network socket. This vulnerability affects Firefox \u003C 87.",
  "published": "2021-03-24T17:00:00Z",
  "severity": "Low",
  "cvss": 6.5,
  "epss": 0.01506,
  "epssPercentile": 0.7452,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2021-23985",
  "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"
  }
}