{
  "cveId": "CVE-2021-42521",
  "url": "https://patchblox.com/security/cve/CVE-2021-42521",
  "summary": "CVE-2021-42521 is fixed in vtk9 on 1 platform, first by DEBIAN-CVE-2021-42521, released August 25, 2022. It is not reported as exploited. Patch Radar priority: High.",
  "title": "vtk9: There is a NULL pointer dereference vulnerability in VTK before 9.2.5, and it lies in IO/Infovis/vtkXMLTreeReader.cxx",
  "description": "There is a NULL pointer dereference vulnerability in VTK before 9.2.5, and it lies in IO/Infovis/vtkXMLTreeReader.cxx. The vendor didn\u0027t check the return value of libxml2 API \u0027xmlDocGetRootElement\u0027, and try to dereference it. It is unsafe as the return value can be NULL and that NULL pointer dereference may crash the application.",
  "published": "2022-08-25T18:15:09Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.01316,
  "epssPercentile": 0.70965,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "vtk9",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "9.1.0\u002Breally9.1.0\u002Bdfsg2-8",
      "fix": "DEBIAN-CVE-2021-42521",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-42521",
      "released": "2022-08-25T18:15:09Z"
    },
    {
      "platform": "linux",
      "product": "vtk9",
      "release": "Debian 14",
      "fixedVersion": "9.1.0\u002Breally9.1.0\u002Bdfsg2-8",
      "fix": "DEBIAN-CVE-2021-42521",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-42521",
      "released": "2022-08-25T18:15:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}