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CVE-2026-20921— Windows SMB Server Elevation of Privilege Vulnerability

CVSS 7.5 · High EPSS 0.08% · P23

Affected Version Matrix 24

VendorProductVersion RangeStatus
MicrosoftWindows 10 Version 160710.0.14393.0< 10.0.14393.8783affected
MicrosoftWindows 10 Version 180910.0.17763.0< 10.0.17763.8276affected
MicrosoftWindows 10 Version 21H210.0.19044.0< 10.0.19044.6809affected
MicrosoftWindows 10 Version 22H210.0.19045.0< 10.0.19045.6809affected
MicrosoftWindows 11 version 22H310.0.22631.0< 10.0.22631.6491affected
MicrosoftWindows 11 Version 23H210.0.22631.0< 10.0.22631.6491affected
MicrosoftWindows 11 Version 24H210.0.26100.0< 10.0.26100.7623affected
MicrosoftWindows 11 Version 25H210.0.26200.0< 10.0.26200.7623affected
MicrosoftWindows Server 2008 R2 Service Pack 16.1.7601.0< 6.1.7601.28117affected
MicrosoftWindows Server 2008 R2 Service Pack 1 (Server Core installation)6.1.7601.0< 6.1.7601.28117affected
MicrosoftWindows Server 2008 Service Pack 26.0.6003.0< 6.0.6003.23717affected
MicrosoftWindows Server 2008 Service Pack 2 (Server Core installation)6.0.6003.0< 6.0.6003.23717affected
MicrosoftWindows Server 20126.2.9200.0< 6.2.9200.25868affected
MicrosoftWindows Server 2012 (Server Core installation)6.2.9200.0< 6.2.9200.25868affected
MicrosoftWindows Server 2012 R26.3.9600.0< 6.3.9600.22968affected
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.9600.0< 6.3.9600.22968affected
MicrosoftWindows Server 201610.0.14393.0< 10.0.14393.8783affected
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0< 10.0.14393.8783affected
MicrosoftWindows Server 201910.0.17763.0< 10.0.17763.8276affected
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0< 10.0.17763.8276affected
MicrosoftWindows Server 202210.0.20348.0< 10.0.20348.4648affected
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0< 10.0.25398.2092affected
MicrosoftWindows Server 202510.0.26100.0< 10.0.26100.32230affected
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0< 10.0.26100.32230affected
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I. Basic Information for CVE-2026-20921

Vulnerability Information
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Vulnerability Title
Windows SMB Server Elevation of Privilege Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Windows SMB Server 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows SMB Server是美国微软（Microsoft）公司的一个网络文件共享协议。它允许计算机上的应用程序读取和写入文件以及从计算机网络中的服务器程序请求服务。 Microsoft Windows SMB Server存在竞争条件问题漏洞。攻击者利用该漏洞可以提升权限。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,Wi
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

VendorProductAffected VersionsCPESubscribe
MicrosoftWindows 10 Version 1607 10.0.14393.0 ~ 10.0.14393.8783 -
MicrosoftWindows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.8276 -
MicrosoftWindows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.6809 -
MicrosoftWindows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.6809 -
MicrosoftWindows 11 version 22H3 10.0.22631.0 ~ 10.0.22631.6491 -
MicrosoftWindows 11 Version 23H2 10.0.22631.0 ~ 10.0.22631.6491 -
MicrosoftWindows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.7623 -
MicrosoftWindows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.7623 -
MicrosoftWindows Server 2008 R2 Service Pack 1 6.1.7601.0 ~ 6.1.7601.28117 -
MicrosoftWindows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 ~ 6.1.7601.28117 -
MicrosoftWindows Server 2008 Service Pack 2 6.0.6003.0 ~ 6.0.6003.23717 -
MicrosoftWindows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 ~ 6.0.6003.23717 -
MicrosoftWindows Server 2012 6.2.9200.0 ~ 6.2.9200.25868 -
MicrosoftWindows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.25868 -
MicrosoftWindows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.22968 -
MicrosoftWindows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.22968 -
MicrosoftWindows Server 2016 10.0.14393.0 ~ 10.0.14393.8783 -
MicrosoftWindows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.8783 -
MicrosoftWindows Server 2019 10.0.17763.0 ~ 10.0.17763.8276 -
MicrosoftWindows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.8276 -
MicrosoftWindows Server 2022 10.0.20348.0 ~ 10.0.20348.4648 -
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 ~ 10.0.25398.2092 -
MicrosoftWindows Server 2025 10.0.26100.0 ~ 10.0.26100.32230 -
MicrosoftWindows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.32230 -

II. Public POCs for CVE-2026-20921

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III. Intelligence Information for CVE-2026-20921

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Same Patch Batch · Microsoft · 2026-01-13 · 112 CVEs total

CVE-2026-209639.8 CRITICALMicrosoft SharePoint Remote Code Execution Vulnerability
CVE-2026-209478.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-208688.8 HIGHWindows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-209528.4 HIGHMicrosoft Office Remote Code Execution Vulnerability
CVE-2026-209538.4 HIGHMicrosoft Office Remote Code Execution Vulnerability
CVE-2026-209448.4 HIGHMicrosoft Word Remote Code Execution Vulnerability
CVE-2026-208568.1 HIGHWindows Server Update Service (WSUS) Remote Code Execution Vulnerability
CVE-2026-209318.0 HIGHWindows Telephony Service Elevation of Privilege Vulnerability
CVE-2026-208597.8 HIGHWindows Kernel-Mode Driver Elevation of Privilege Vulnerability
CVE-2026-212247.8 HIGHAzure Connected Machine Agent Elevation of Privilege Vulnerability
CVE-2026-208377.8 HIGHWindows Media Remote Code Execution Vulnerability
CVE-2026-209567.8 HIGHMicrosoft Excel Remote Code Execution Vulnerability
CVE-2026-208407.8 HIGHWindows NTFS Remote Code Execution Vulnerability
CVE-2026-209557.8 HIGHMicrosoft Excel Remote Code Execution Vulnerability
CVE-2026-209517.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-209467.8 HIGHMicrosoft Excel Remote Code Execution Vulnerability
CVE-2026-208577.8 HIGHWindows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2026-209187.8 HIGHWindows Management Services Elevation of Privilege Vulnerability
CVE-2026-209207.8 HIGHWin32k Elevation of Privilege Vulnerability
CVE-2026-209227.8 HIGHWindows NTFS Remote Code Execution Vulnerability

Showing top 20 of 112 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1607
Same vendor: Microsoft
Same weakness: CWE-362

V. Comments for CVE-2026-20921

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