ubuntu-cve-2021-42521
Vulnerability from osv_ubuntu
Published
2022-08-25 18:15
Modified
2026-04-22 07:40
Summary
Details
There is a NULL pointer dereference vulnerability in VTK before 9.2.5, and it lies in IO/Infovis/vtkXMLTreeReader.cxx. The vendor didn't check the return value of libxml2 API 'xmlDocGetRootElement', and try to dereference it. It is unsafe as the return value can be NULL and that NULL pointer dereference may crash the application.
Severity
7.5 (High)
N/A (UNKNOWN)
References
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],
"aliases": [],
"details": "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.",
"id": "UBUNTU-CVE-2021-42521",
"modified": "2026-04-22T07:40:10Z",
"published": "2022-08-25T18:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-42521"
},
{
"type": "REPORT",
"url": "https://gitlab.kitware.com/vtk/vtk/-/issues/17818"
},
{
"type": "REPORT",
"url": "https://gitlab.kitware.com/vtk/vtk/issues/17818"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-42521"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-42521"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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