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CVE-2021-38646— Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Microsoft 365 Apps for Enterprise
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 Office是美国微软（Microsoft）公司的一款办公软件套件产品。该产品常用组件包括Word、Excel、Access、Powerpoint、FrontPage等。 Microsoft Office 存在缓冲区错误漏洞。以下产品和版本受到影响：Microsoft Office 2019 for 32-bit editions,Microsoft Office 2019 for 64-bit editions,Microsoft 365 Apps for Enterprise fo

CVSS 7.8 · High KEV · Ransomware EPSS 7.99% · P95

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
Microsoft Microsoft 365 Apps for Enterprise 16.0.1< https://aka.ms/OfficeSecurityReleases affected
Microsoft Microsoft Office 2013 Service Pack 1 15.0.0< 5381.1000 affected
Microsoft Microsoft Office 2016 16.0.0< 5215.1000 affected
Microsoft Microsoft Office 2019 19.0.0< https://aka.ms/OfficeSecurityReleases affected
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I. Basic Information for CVE-2021-38646

Vulnerability Information
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Vulnerability Title
Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 Office 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Office是美国微软（Microsoft）公司的一款办公软件套件产品。该产品常用组件包括Word、Excel、Access、Powerpoint、FrontPage等。 Microsoft Office 存在缓冲区错误漏洞。以下产品和版本受到影响：Microsoft Office 2019 for 32-bit editions,Microsoft Office 2019 for 64-bit editions,Microsoft 365 Apps for Enterprise fo
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

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft 365 Apps for Enterprise 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
Microsoft Microsoft Office 2013 Service Pack 1 15.0.0 ~ 5381.1000 -
Microsoft Microsoft Office 2016 16.0.0 ~ 5215.1000 -
Microsoft Microsoft Office 2019 19.0.0 ~ https://aka.ms/OfficeSecurityReleases -

II. Public POCs for CVE-2021-38646

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III. Intelligence Information for CVE-2021-38646

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Vendor Advisories for CVE-2021-38646 (2)

Same Patch Batch · Microsoft · 2021-09-15 · 61 CVEs total

CVE-2021-38647 9.8 CRITICAL Open Management Infrastructure (OMI) Remote Code Execution Vulnerability
CVE-2021-36954 8.8 HIGH Windows Bind Filter Driver Elevation of Privilege Vulnerability
CVE-2021-40444 8.8 HIGH Microsoft MSHTML Remote Code Execution Vulnerability
CVE-2021-36965 8.8 HIGH Windows WLAN AutoConfig Service Remote Code Execution Vulnerability
CVE-2021-26435 8.1 HIGH Windows Scripting Engine Memory Corruption Vulnerability
CVE-2021-36967 8.0 HIGH Windows WLAN AutoConfig Service Elevation of Privilege Vulnerability
CVE-2021-38654 7.8 HIGH Microsoft Office Visio Remote Code Execution Vulnerability
CVE-2021-38625 7.8 HIGH Windows Kernel Elevation of Privilege Vulnerability
CVE-2021-38653 7.8 HIGH Microsoft Office Visio Remote Code Execution Vulnerability
CVE-2021-38644 7.8 HIGH Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
CVE-2021-38645 7.8 HIGH Open Management Infrastructure Elevation of Privilege Vulnerability
CVE-2021-38648 7.8 HIGH Open Management Infrastructure Elevation of Privilege Vulnerability
CVE-2021-38639 7.8 HIGH Win32k Elevation of Privilege Vulnerability
CVE-2021-38633 7.8 HIGH Windows Common Log File System Driver Elevation of Privilege Vulnerability
CVE-2021-38655 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-38630 7.8 HIGH Windows Event Tracing Elevation of Privilege Vulnerability
CVE-2021-38656 7.8 HIGH Microsoft Word Remote Code Execution Vulnerability
CVE-2021-38628 7.8 HIGH Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2021-38626 7.8 HIGH Windows Kernel Elevation of Privilege Vulnerability
CVE-2021-36975 7.8 HIGH Win32k Elevation of Privilege Vulnerability

Showing top 20 of 61 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft 365 Apps for Enterprise
Same vendor: Microsoft

V. Comments for CVE-2021-38646

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