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CVE-2021-34471— Microsoft Defender Elevation of Privilege Vulnerability

Quick assessment

Affected
Microsoft Microsoft Malware Protection Engine
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.

Microsoft Windows Defender是美国微软（Microsoft）公司的一套Windows系统附带的防病毒软件。 Microsoft Windows Defender存在权限许可和访问控制问题漏洞。以下产品和版本受到影响：Microsoft Malware Protection Engine。

CVSS 7.8 · High EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft Malware Protection Engine 1.1.0.0< 1.1.18400.4 affected
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I. Basic Information for CVE-2021-34471

Vulnerability Information
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Vulnerability Title
Microsoft Defender Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Microsoft Defender Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Defender 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Defender是美国微软（Microsoft）公司的一套Windows系统附带的防病毒软件。 Microsoft Windows Defender存在权限许可和访问控制问题漏洞。以下产品和版本受到影响：Microsoft Malware Protection Engine。
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
Microsoft Microsoft Malware Protection Engine 1.1.0.0 ~ 1.1.18400.4 -

II. Public POCs for CVE-2021-34471

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III. Intelligence Information for CVE-2021-34471

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Vendor Advisories for CVE-2021-34471 (2)

Same Patch Batch · Microsoft · 2021-08-12 · 45 CVEs total

CVE-2021-26424 9.9 CRITICAL Windows TCP/IP Remote Code Execution Vulnerability
CVE-2021-26432 9.8 CRITICAL Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
CVE-2021-36947 8.8 HIGH Windows Print Spooler Remote Code Execution Vulnerability
CVE-2021-34535 8.8 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2021-36936 8.8 HIGH Windows Print Spooler Remote Code Execution Vulnerability
CVE-2021-34524 8.1 HIGH Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2021-34537 7.8 HIGH Windows Bluetooth Driver Elevation of Privilege Vulnerability
CVE-2021-36958 7.8 HIGH Windows Print Spooler Remote Code Execution Vulnerability
CVE-2021-26431 7.8 HIGH Windows Recovery Environment Agent Elevation of Privilege Vulnerability
CVE-2021-26425 7.8 HIGH Windows Event Tracing Elevation of Privilege Vulnerability
CVE-2021-34478 7.8 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2021-36948 7.8 HIGH Windows Update Medic Service Elevation of Privilege Vulnerability
CVE-2021-34483 7.8 HIGH Windows Print Spooler Elevation of Privilege Vulnerability
CVE-2021-36927 7.8 HIGH Windows Digital TV Tuner device registration application Elevation of Privilege Vulnerabil
CVE-2021-34484 7.8 HIGH Windows User Profile Service Elevation of Privilege Vulnerability
CVE-2021-36937 7.8 HIGH Windows Media MPEG-4 Video Decoder Remote Code Execution Vulnerability
CVE-2021-34536 7.8 HIGH Windows Storage Spaces Controller Elevation of Privilege Vulnerability
CVE-2021-34486 7.8 HIGH Windows Event Tracing Elevation of Privilege Vulnerability
CVE-2021-34533 7.8 HIGH Windows Graphics Component Font Parsing Remote Code Execution Vulnerability
CVE-2021-34530 7.8 HIGH Windows Graphics Component Remote Code Execution Vulnerability

Showing top 20 of 45 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft Malware Protection Engine
Same vendor: Microsoft

V. Comments for CVE-2021-34471

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