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CVE-2021-42521

Quick assessment

Affected

n/a vtk

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

VTK是一个用于图像处理、3D 图形、体绘制和可视化的开源软件系统。 VTK存在代码问题漏洞，该漏洞源于其IO/Infovis/vtkXMLTreeReader.cxx组件没有检查libxml2 API “xmlDocGetRootElement”的返回值并试图解除对它的引用可能会造成空指针引用导致应用程序崩溃。

AI Predicted 5.3 Difficulty: Easy EPSS 1.32% · P71 Updated Feb 25, 2026

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

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I. Basic Information for CVE-2021-42521

Vulnerability Information

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Vulnerability Title

N/A

Source: CVE Program / CVE List V5

Vulnerability 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'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.

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

未加控制的资源消耗(资源穷尽)

Source: CVE Program / CVE List V5

Vulnerability Title

VTK 代码问题漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
-	vtk	VTK - 9.0.0 and before	-

II. Public POCs for CVE-2021-42521

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2021-42521

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Mailing List Discussions for CVE-2021-42521 (1)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PCTMSAAVP4BW2HTZLDWMGKZ2WEC5OFLK/ vendor-advisory

Other References for CVE-2021-42521 (2)

https://www.cve.org/CVERecord?id=CVE-2021-42521

Same Patch Batch · n/a · 2022-08-25 · 214 CVEs total

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CVE-2022-37318	7.0 HIGH	Archer Platform 跨站脚本漏洞
CVE-2022-37316	6.5 MEDIUM	Archer Platform 安全漏洞
CVE-2022-37240		Alt-N MDaemon 注入漏洞
CVE-2022-37817		Tenda AX1803 缓冲区错误漏洞
CVE-2022-37824		Tenda AX1803 缓冲区错误漏洞
CVE-2022-37814		Tenda AC1206 缓冲区错误漏洞
CVE-2022-37820		Tenda AX1803 缓冲区错误漏洞
CVE-2022-37816		Tenda AC1206 缓冲区错误漏洞
CVE-2022-37822		Tenda AX1803 缓冲区错误漏洞
CVE-2022-37245		Alt-N MDaemon 跨站脚本漏洞
CVE-2022-37244		Alt-N MDaemon 跨站脚本漏洞
CVE-2022-37243		Alt-N MDaemon 跨站脚本漏洞
CVE-2022-37242		Alt-N MDaemon 注入漏洞
CVE-2022-37241		Alt-N MDaemon 跨站脚本漏洞
CVE-2022-2255		mod_wsgi 数据伪造问题漏洞
CVE-2022-37160		Claroline 跨站脚本漏洞
CVE-2022-2991		Linux kernel 缓冲区错误漏洞
CVE-2022-23235		Netapp Active IQ Unified Manager 信息泄露漏洞
CVE-2022-37159		Claroline 代码问题漏洞

Showing top 20 of 214 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: vtk

Same vendor: n/a

Same weakness: CWE-400