{
  "cveId": "CVE-2025-1020",
  "url": "https://patchblox.com/security/cve/CVE-2025-1020",
  "summary": "CVE-2025-1020 is fixed in 212 products on 2 platforms, first by Firefox Developer Edition (ach) 135.0, released January 24, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Memory safety bugs fixed in Firefox 135 and Thunderbird 135",
  "description": "Memory safety bugs present in Firefox 134 and Thunderbird 134. 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 was fixed in Firefox 135 and Thunderbird 135.",
  "published": "2025-02-04T06:15:00Z",
  "severity": "Medium",
  "cvss": 9.8,
  "cwe": "CWE-787: Out-of-bounds Write",
  "epss": 0.0054,
  "epssPercentile": 0.45643,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2025-1020",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ach)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ach) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ach-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (af)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (af) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.af-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (an)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (an) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.an-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ar)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ar) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ar-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ast)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ast) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ast-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (az)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (az) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.az-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (be)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (be) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.be-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (bg)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (bg) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.bg-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (bn)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (bn) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.bn-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (br)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (br) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.br-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (bs)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (bs) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.bs-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ca)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ca) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ca-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ca-valencia)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ca-valencia) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ca-valencia-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (cak)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (cak) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.cak-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (cs)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (cs) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.cs-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (cy)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (cy) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.cy-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (da)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (da) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.da-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (de)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (de) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.de-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (dsb)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (dsb) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.dsb-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (el)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (el) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.el-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (en-CA)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (en-CA) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.en-ca-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (en-GB)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (en-GB) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.en-gb-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (en-US)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (en-US) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (eo)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (eo) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.eo-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (es-AR)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (es-AR) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.es-ar-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (es-CL)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (es-CL) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.es-cl-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (es-ES)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (es-ES) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.es-es-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (es-MX)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (es-MX) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.es-mx-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (et)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (et) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.et-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (eu)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (eu) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.eu-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (fa)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (fa) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.fa-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ff)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ff) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ff-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (fi)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (fi) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.fi-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (fr)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (fr) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.fr-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (fur)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (fur) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.fur-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (fy-NL)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (fy-NL) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.fy-nl-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ga-IE)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ga-IE) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ga-ie-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (gd)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (gd) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.gd-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (gl)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (gl) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.gl-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (gn)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (gn) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.gn-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (gu-IN)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (gu-IN) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.gu-in-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (he)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (he) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.he-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (hi-IN)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (hi-IN) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.hi-in-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (hr)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (hr) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.hr-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (hsb)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (hsb) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.hsb-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (hu)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (hu) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.hu-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (hy-AM)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (hy-AM) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.hy-am-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ia)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ia) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ia-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (id)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (id) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.id-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (is)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (is) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.is-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (it)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (it) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.it-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ja)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ja) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ja-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ka)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ka) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ka-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (kab)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (kab) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.kab-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (kk)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (kk) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.kk-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (km)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (km) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.km-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (kn)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (kn) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.kn-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (ko)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (ko) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.ko-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (lij)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (lij) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.lij-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (lt)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (lt) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.lt-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (lv)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (lv) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.lv-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (mk)",
      "fixedVersion": "135.0",
      "fix": "Firefox Developer Edition (mk) 135.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition.mk-135.0",
      "released": "2025-01-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Firefox Developer Edition (mr)",
      "fixedVersion": "135.0",
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    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}