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CVE-2026-20927— Windows SMB Server Denial of Service Vulnerability

Quick assessment

Affected
Microsoft Windows 10 Version 1607
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 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。攻击者利用该漏洞导致系统拒绝服务。以下产品和版本受到影响：Windows 10 Version 21H2 for x64-based Systems,Windows 10 Version 22H2 for x64-based Syste

CVSS 5.3 · Medium EPSS 0.93% · P57

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 24

VendorProduct Version RangeStatus
Microsoft Windows 10 Version 1607 10.0.14393.0< 10.0.14393.8783 affected
Microsoft Windows 10 Version 1809 10.0.17763.0< 10.0.17763.8276 affected
Microsoft Windows 10 Version 21H2 10.0.19044.0< 10.0.19044.6809 affected
Microsoft Windows 10 Version 22H2 10.0.19045.0< 10.0.19045.6809 affected
Microsoft Windows 11 version 23H2 10.0.22631.0< 10.0.22631.6491 affected
Microsoft Windows 11 Version 23H2 10.0.22631.0< 10.0.22631.6491 affected
Microsoft Windows 11 Version 24H2 10.0.26100.0< 10.0.26100.7623 affected
Microsoft Windows 11 Version 25H2 10.0.26200.0< 10.0.26200.7623 affected
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.0< 6.1.7601.28117 affected
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0< 6.1.7601.28117 affected
Microsoft Windows Server 2008 Service Pack 2 6.0.6003.0< 6.0.6003.23717 affected
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0< 6.0.6003.23717 affected
Microsoft Windows Server 2012 6.2.9200.0< 6.2.9200.25868 affected
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0< 6.2.9200.25868 affected
Microsoft Windows Server 2012 R2 6.3.9600.0< 6.3.9600.22968 affected
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0< 6.3.9600.22968 affected
Microsoft Windows Server 2016 10.0.14393.0< 10.0.14393.8783 affected
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0< 10.0.14393.8783 affected
Microsoft Windows Server 2019 10.0.17763.0< 10.0.17763.8276 affected
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0< 10.0.17763.8276 affected
Microsoft Windows Server 2022 10.0.20348.0< 10.0.20348.4648 affected
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0< 10.0.25398.2092 affected
Microsoft Windows Server 2025 10.0.26100.0< 10.0.26100.32230 affected
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0< 10.0.26100.32230 affected
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I. Basic Information for CVE-2026-20927

Vulnerability Information
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Vulnerability Title
Windows SMB Server Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to deny service over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
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。攻击者利用该漏洞导致系统拒绝服务。以下产品和版本受到影响：Windows 10 Version 21H2 for x64-based Systems,Windows 10 Version 22H2 for x64-based Syste
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 Windows 10 Version 1607 10.0.14393.0 ~ 10.0.14393.8783 -
Microsoft Windows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.8276 -
Microsoft Windows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.6809 -
Microsoft Windows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.6809 -
Microsoft Windows 11 version 23H2 10.0.22631.0 ~ 10.0.22631.6491 -
Microsoft Windows 11 Version 23H2 10.0.22631.0 ~ 10.0.22631.6491 -
Microsoft Windows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.7623 -
Microsoft Windows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.7623 -
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.0 ~ 6.1.7601.28117 -
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 ~ 6.1.7601.28117 -
Microsoft Windows Server 2008 Service Pack 2 6.0.6003.0 ~ 6.0.6003.23717 -
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 ~ 6.0.6003.23717 -
Microsoft Windows Server 2012 6.2.9200.0 ~ 6.2.9200.25868 -
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.25868 -
Microsoft Windows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.22968 -
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.22968 -
Microsoft Windows Server 2016 10.0.14393.0 ~ 10.0.14393.8783 -
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.8783 -
Microsoft Windows Server 2019 10.0.17763.0 ~ 10.0.17763.8276 -
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.8276 -
Microsoft Windows Server 2022 10.0.20348.0 ~ 10.0.20348.4648 -
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 ~ 10.0.25398.2092 -
Microsoft Windows Server 2025 10.0.26100.0 ~ 10.0.26100.32230 -
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.32230 -

II. Public POCs for CVE-2026-20927

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III. Intelligence Information for CVE-2026-20927

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

CVE-2026-20963 9.8 CRITICAL Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2026-20947 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-20868 8.8 HIGH Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-20952 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-20953 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-20944 8.4 HIGH Microsoft Word Remote Code Execution Vulnerability
CVE-2026-20856 8.1 HIGH Windows Server Update Service (WSUS) Remote Code Execution Vulnerability
CVE-2026-20931 8.0 HIGH Windows Telephony Service Elevation of Privilege Vulnerability
CVE-2026-20859 7.8 HIGH Windows Kernel-Mode Driver Elevation of Privilege Vulnerability
CVE-2026-21224 7.8 HIGH Azure Connected Machine Agent Elevation of Privilege Vulnerability
CVE-2026-20837 7.8 HIGH Windows Media Remote Code Execution Vulnerability
CVE-2026-20956 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20840 7.8 HIGH Windows NTFS Remote Code Execution Vulnerability
CVE-2026-20955 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20951 7.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-20946 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20857 7.8 HIGH Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2026-20918 7.8 HIGH Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20920 7.8 HIGH Win32k Elevation of Privilege Vulnerability
CVE-2026-20922 7.8 HIGH Windows 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-2026-20927

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