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CVE-2021-34448— Scripting Engine Memory Corruption Vulnerability

Quick assessment

Affected

Microsoft Windows 10 Version 1507

Exploitation

Confirmed exploitation in the wild; remediate immediately

Recommended action

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

Microsoft Scripting Engine是美国微软（Microsoft）公司的一种工具，为JScript和VBScript提供脚本引擎。 Microsoft Scripting Engine存在缓冲区错误漏洞。以下产品和版本受到影响：Windows 10 Version 1809 for 32-bit Systems,Windows 10 Version 1809 for x64-based Systems,Windows 10 Version 1809 for ARM64-based Sys

CVSS 6.8 · Medium KEV EPSS 40.06% · P99 Updated Aug 10, 2026

In-the-Wild Activity Observed cisa_kev · confirmed

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

Vendor	Product	Version Range	Status
Microsoft	Windows 10 Version 1507	`10.0.10240.0< 10.0.10240.19003`	affected
Microsoft	Windows 10 Version 1607	`10.0.14393.0< 10.0.14393.4530`	affected
Microsoft	Windows 10 Version 1809	`10.0.17763.0< 10.0.17763.2061`	affected
		`10.0.0< 10.0.17763.2061`	affected
Microsoft	Windows 10 Version 1909	`10.0.0< 10.0.18363.1679`	affected
Microsoft	Windows 10 Version 2004	`10.0.0< 10.0.19041.1110`	affected
Microsoft	Windows 10 Version 20H2	`10.0.0< 10.0.19042.1110`	affected
Microsoft	Windows 10 Version 21H1	`10.0.0< 10.0.19043.1110`	affected
Microsoft	Windows 7	`6.1.0< 6.1.7601.25661`	affected
Microsoft	Windows 7 Service Pack 1	`6.1.0< 6.1.7601.25661`	affected
Microsoft	Windows 8.1	`6.3.0< 6.3.9600.20069`	affected
Microsoft	Windows Server 2008 R2 Service Pack 1	`6.1.7601.0< 6.1.7601.25661`	affected
Microsoft	Windows Server 2012	`6.2.9200.0< 6.2.9200.23409`	affected
Microsoft	Windows Server 2012 R2	`6.3.9600.0< 6.3.9600.20069`	affected
Microsoft	Windows Server 2016	`10.0.14393.0< 10.0.14393.4530`	affected
Microsoft	Windows Server 2019	`10.0.17763.0< 10.0.17763.2061`	affected

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I. Basic Information for CVE-2021-34448

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:H/I:H/A:N

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)

Shenlong Deep Dive — AI Deep Analysis

10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.

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Affected Products

Vendor	Product	Affected Versions	CPE
Microsoft	Windows 10 Version 1507	10.0.10240.0 ~ 10.0.10240.19003	-
Microsoft	Windows 10 Version 1607	10.0.14393.0 ~ 10.0.14393.4530	-
Microsoft	Windows 10 Version 1809	10.0.17763.0 ~ 10.0.17763.2061	-
Microsoft	Windows 10 Version 1809	10.0.0 ~ 10.0.17763.2061	-
Microsoft	Windows 10 Version 1909	10.0.0 ~ 10.0.18363.1679	-
Microsoft	Windows 10 Version 2004	10.0.0 ~ 10.0.19041.1110	-
Microsoft	Windows 10 Version 20H2	10.0.0 ~ 10.0.19042.1110	-
Microsoft	Windows 10 Version 21H1	10.0.0 ~ 10.0.19043.1110	-
Microsoft	Windows 7	6.1.0 ~ 6.1.7601.25661	-
Microsoft	Windows 7 Service Pack 1	6.1.0 ~ 6.1.7601.25661	-
Microsoft	Windows 8.1	6.3.0 ~ 6.3.9600.20069	-
Microsoft	Windows Server 2008 R2 Service Pack 1	6.1.7601.0 ~ 6.1.7601.25661	-
Microsoft	Windows Server 2012	6.2.9200.0 ~ 6.2.9200.23409	-
Microsoft	Windows Server 2012 R2	6.3.9600.0 ~ 6.3.9600.20069	-
Microsoft	Windows Server 2016	10.0.14393.0 ~ 10.0.14393.4530	-
Microsoft	Windows Server 2019	10.0.17763.0 ~ 10.0.17763.2061	-

II. Public POCs for CVE-2021-34448

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2021-34448

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Vendor Advisories for CVE-2021-34448 (2)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34448 x_refsource_MISC
🔗 404 ~ Not found vendor-advisory patch

https://www.cve.org/CVERecord?id=CVE-2021-34448

Same Patch Batch · Microsoft · 2021-07-16 · 27 CVEs total

CVE-2021-34458	9.9 CRITICAL	Windows Kernel Remote Code Execution Vulnerability
CVE-2021-34442	8.8 HIGH	Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-34481	8.8 HIGH	Windows Print Spooler Remote Code Execution Vulnerability
CVE-2021-34450	8.5 HIGH	Windows Hyper-V Remote Code Execution Vulnerability
CVE-2021-34446	8.0 HIGH	Windows HTML Platforms Security Feature Bypass Vulnerability
CVE-2021-34452	7.8 HIGH	Microsoft Word Remote Code Execution Vulnerability
CVE-2021-34438	7.8 HIGH	Windows Font Driver Host Remote Code Execution Vulnerability
CVE-2021-34439	7.8 HIGH	Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2021-34441	7.8 HIGH	Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2021-34445	7.8 HIGH	Windows Remote Access Connection Manager Elevation of Privilege Vulnerability
CVE-2021-34455	7.8 HIGH	Windows File History Service Elevation of Privilege Vulnerability
CVE-2021-34456	7.8 HIGH	Windows Remote Access Connection Manager Elevation of Privilege Vulnerability
CVE-2021-34459	7.8 HIGH	Windows AppContainer Elevation Of Privilege Vulnerability
CVE-2021-34460	7.8 HIGH	Windows Storage Spaces Controller Elevation of Privilege Vulnerability
CVE-2021-34461	7.8 HIGH	Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability
CVE-2021-34464	7.8 HIGH	Microsoft Defender Remote Code Execution Vulnerability
CVE-2021-34467	7.1 HIGH	Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-34449	7.0 HIGH	Win32k Elevation of Privilege Vulnerability
CVE-2021-34462	7.0 HIGH	Windows AppX Deployment Extensions Elevation of Privilege Vulnerability
CVE-2021-34447	6.8 MEDIUM	Windows MSHTML Platform Remote Code Execution Vulnerability

Showing top 20 of 27 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1507

Same vendor: Microsoft

V. Comments for CVE-2021-34448

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

CVE-2021-34448— Scripting Engine Memory Corruption Vulnerability

Quick assessment

Possible ATT&CK Techniques 1 AI

Affected Version Matrix 16

I. Basic Information for CVE-2021-34448

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Shenlong Deep Dive — AI Deep Analysis

Affected Products

II. Public POCs for CVE-2021-34448

III. Intelligence Information for CVE-2021-34448

Vendor Advisories for CVE-2021-34448 (2)

Same Patch Batch · Microsoft · 2021-07-16 · 27 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2021-34448

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