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CVE-2021-31959— Scripting Engine Memory Corruption Vulnerability

Quick assessment

Affected

Microsoft Windows 10 Version 21H1

Exploitation

Public or AI PoC available; prioritize validation

Recommended action

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

Microsoft Windows是美国微软（Microsoft）公司的一套个人设备使用的操作系统。 Microsoft Scripting Engine存在安全漏洞。以下产品和版本受到影响：Windows 10 Version 21H1 for x64-based Systems,Windows 10 Version 21H1 for ARM64-based Systems,Windows 10 Version 21H1 for 32-bit Systems,Windows 10 Version 20H

CVSS 6.4 · Medium EPSS 9.23% · P95 Updated Feb 25, 2026

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

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I. Basic Information for CVE-2021-31959

Vulnerability Information

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Vulnerability Title

Scripting Engine Memory Corruption Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

Scripting Engine Memory Corruption Vulnerability

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Vulnerability Title

Microsoft Scripting Engine 缓冲区错误漏洞

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
Microsoft	Windows 10 Version 21H1	10.0.0 ~ 10.0.19043.1052	`cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1052::::::x64:`
Microsoft	Windows 10 Version 20H2	10.0.0 ~ 10.0.19042.1052	`cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1052::::::arm64:`
Microsoft	Windows 10 Version 2004	10.0.0 ~ 10.0.19041.1052	`cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1052::::::x64:`
Microsoft	Windows 10 Version 1607	10.0.0 ~ 10.0.14393.4467	`cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4467::::::x64:`
Microsoft	Windows Server 2019	10.0.0 ~ 10.0.17763.1999	`cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.1999:::::::*`
Microsoft	Windows 8.1	6.3.0 ~ 6.3.9600.20045	`cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20045::::::x64:`
Microsoft	Windows 10 Version 1909	10.0.0 ~ 10.0.18363.1621	`cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1621::::::x86:`
Microsoft	Windows 10 Version 1809	10.0.0 ~ 10.0.17763.1999	`cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.1999::::::x64:`
Microsoft	Windows 10 Version 1507	10.0.0 ~ 10.0.10240.18967	`cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.18967::::::x86:`
Microsoft	Windows Server 2016	10.0.0 ~ 10.0.14393.4467	`cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4467:::::::*`
Microsoft	Windows Server 2012 R2	6.3.0 ~ 6.3.9600.20045	`cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20045::::::x64:`
Microsoft	Windows Server 2012	6.2.0 ~ 6.2.9200.23372	`cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23372::::::x64:`
Microsoft	Windows Server 2008 R2 Service Pack 1	6.1.0 ~ 6.1.7601.25632	`cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25632::::::x64:`
Microsoft	Windows 7 Service Pack 1	6.1.0 ~ 6.1.7601.25632	`cpe:2.3:o:microsoft:windows_7:6.1.7601.25632:sp1:::::x64:*`
Microsoft	Windows 7	6.1.0 ~ 6.1.7601.25632	`cpe:2.3:o:microsoft:windows_7:6.1.7601.25632:sp1:::::x86:*`

II. Public POCs for CVE-2021-31959

#	POC Description	Source Link	Shenlong Link

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default-local-qwen3.6 · 6021 chars

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III. Intelligence Information for CVE-2021-31959

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Vendor Advisories for CVE-2021-31959 (1)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31959 x_refsource_MISC

Exploits & Public PoCs for CVE-2021-31959 (1)

http://packetstormsecurity.com/files/163056/Internet-Explorer-jscript9.dll-Memory-Corruption.html x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2021-31959

Same Patch Batch · Microsoft · 2021-06-08 · 50 CVEs total

CVE-2021-31962	9.4 CRITICAL	Kerberos AppContainer Security Feature Bypass Vulnerability
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CVE-2021-31985	7.8 HIGH	Microsoft Defender Remote Code Execution Vulnerability
CVE-2021-31956	7.8 HIGH	Windows NTFS Elevation of Privilege Vulnerability
CVE-2021-31983	7.8 HIGH	Paint 3D Remote Code Execution Vulnerability
CVE-2021-31943	7.8 HIGH	3D Viewer Remote Code Execution Vulnerability
CVE-2021-31940	7.8 HIGH	Microsoft Office Graphics Remote Code Execution Vulnerability
CVE-2021-31939	7.8 HIGH	Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-1675	7.8 HIGH	Windows Print Spooler Remote Code Execution Vulnerability
CVE-2021-31969	7.8 HIGH	Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2021-31946	7.8 HIGH	Paint 3D Remote Code Execution Vulnerability
CVE-2021-31945	7.8 HIGH	Paint 3D Remote Code Execution Vulnerability
CVE-2021-31967	7.8 HIGH	VP9 Video Extensions Remote Code Execution Vulnerability
CVE-2021-31951	7.8 HIGH	Windows Kernel Elevation of Privilege Vulnerability
CVE-2021-31953	7.8 HIGH	Windows Filter Manager Elevation of Privilege Vulnerability
CVE-2021-31952	7.8 HIGH	Windows Kernel-Mode Driver Elevation of Privilege Vulnerability
CVE-2021-31954	7.8 HIGH	Windows Common Log File System Driver Elevation of Privilege Vulnerability

Showing top 20 of 50 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Windows 10 Version 21H1

Same vendor: Microsoft

V. Comments for CVE-2021-31959

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2021-31959— Scripting Engine Memory Corruption Vulnerability

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2021-31959

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2021-31959

III. Intelligence Information for CVE-2021-31959

Vendor Advisories for CVE-2021-31959 (1)

Exploits & Public PoCs for CVE-2021-31959 (1)

Same Patch Batch · Microsoft · 2021-06-08 · 50 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2021-31959

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