{
  "cveId": "CVE-2020-12402",
  "url": "https://patchblox.com/security/cve/CVE-2020-12402",
  "summary": "CVE-2020-12402 is fixed in 15 products on 2 platforms, first by libnss3 2:3.35-2ubuntu2.9, released June 18, 2020. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Firefox ESR: During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm\u2026",
  "description": "During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes. *Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox \u003C 78.",
  "published": "2020-06-18T17:00:00Z",
  "severity": "Moderate",
  "cvss": 4.4,
  "epss": 0.00337,
  "epssPercentile": 0.27295,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2020-12402",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Mozilla Firefox ESR (en-US)",
      "fixedVersion": "78.0esr",
      "fix": "Mozilla Firefox ESR (en-US) 78.0esr",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr-78.0esr",
      "released": "2020-06-25T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnss3",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2:3.35-2ubuntu2.9",
      "fix": "libnss3 2:3.35-2ubuntu2.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnss3-2-3.35-2ubuntu2.9",
      "released": "2020-06-18T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnss3",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2:3.49.1-1ubuntu1.2",
      "fix": "libnss3 2:3.49.1-1ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnss3-2-3.49.1-1ubuntu1.2",
      "released": "2020-06-18T17:00:00Z"
    },
    {
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      "product": "libnss3-tools",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
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      "fix": "libnss3-tools 2:3.35-2ubuntu2.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnss3-tools-2-3.35-2ubuntu2.9",
      "released": "2020-06-18T17:00:00Z"
    },
    {
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      "product": "libnss3-tools",
      "release": "Ubuntu 20.04 LTS (focal)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnss3-tools-2-3.49.1-1ubuntu1.2",
      "released": "2020-06-18T17:00:00Z"
    },
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      "product": "nspr",
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      "fix": "RHSA-2020:3280",
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      "released": "2020-08-04T00:00:00Z"
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  "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"
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}