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CVE-2026-21249— Windows NTLM Spoofing Vulnerability

Quick assessment

Affected
Microsoft Windows 10 Version 1607
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft NTLM是美国微软（Microsoft）公司的一个在包括运行Windows操作系统的系统以及独立系统在内的网络上使用的身份验证协议。 Microsoft NTLM存在安全漏洞。攻击者利用该漏洞执行欺骗攻击。以下产品和版本受到影响：Windows 11 Version 26H1 for ARM64-based Systems,Windows 11 version 26H1 for x64-based Systems,Windows 10 Version 1809 for 32-bit S

CVSS 3.3 · Low EPSS 11.44% · P96

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 20

VendorProduct Version RangeStatus
Microsoft Windows 10 Version 1607 10.0.14393.0< 10.0.14393.8868 affected
Microsoft Windows 10 Version 1809 10.0.17763.0< 10.0.17763.8389 affected
Microsoft Windows 10 Version 21H2 10.0.19044.0< 10.0.19044.6937 affected
Microsoft Windows 10 Version 22H2 10.0.19045.0< 10.0.19045.6937 affected
Microsoft Windows 11 version 22H3 10.0.22631.0< 10.0.22631.6649 affected
Microsoft Windows 11 Version 23H2 10.0.22631.0< 10.0.22631.6649 affected
Microsoft Windows 11 Version 24H2 10.0.26100.0< 10.0.26100.7840 affected
Microsoft Windows 11 Version 25H2 10.0.26200.0< 10.0.26200.7840 affected
Microsoft Windows 11 version 26H1 10.0.28000.0< 10.0.28000.1575 affected
Microsoft Windows 11 Version 26H1 10.0.28000.0< 10.0.28000.1575 affected
Microsoft Windows Server 2012 R2 6.3.9600.0< 6.3.9600.23022 affected
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0< 6.3.9600.23022 affected
Microsoft Windows Server 2016 10.0.14393.0< 10.0.14393.8868 affected
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0< 10.0.14393.8868 affected
Microsoft Windows Server 2019 10.0.17763.0< 10.0.17763.8389 affected
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0< 10.0.17763.8389 affected
Microsoft Windows Server 2022 10.0.20348.0< 10.0.20348.4773 affected
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0< 10.0.25398.2149 affected
Microsoft Windows Server 2025 10.0.26100.0< 10.0.26100.32370 affected
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0< 10.0.26100.32370 affected
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I. Basic Information for CVE-2026-21249

Vulnerability Information
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Vulnerability Title
Windows NTLM Spoofing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft NTLM 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft NTLM是美国微软（Microsoft）公司的一个在包括运行Windows操作系统的系统以及独立系统在内的网络上使用的身份验证协议。 Microsoft NTLM存在安全漏洞。攻击者利用该漏洞执行欺骗攻击。以下产品和版本受到影响：Windows 11 Version 26H1 for ARM64-based Systems,Windows 11 version 26H1 for x64-based Systems,Windows 10 Version 1809 for 32-bit S
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 ~ 10.0.14393.8868 -
Microsoft Windows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.8389 -
Microsoft Windows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.6937 -
Microsoft Windows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.6937 -
Microsoft Windows 11 version 22H3 10.0.22631.0 ~ 10.0.22631.6649 -
Microsoft Windows 11 Version 23H2 10.0.22631.0 ~ 10.0.22631.6649 -
Microsoft Windows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.7840 -
Microsoft Windows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.7840 -
Microsoft Windows 11 version 26H1 10.0.28000.0 ~ 10.0.28000.1575 -
Microsoft Windows 11 Version 26H1 10.0.28000.0 ~ 10.0.28000.1575 -
Microsoft Windows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.23022 -
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.23022 -
Microsoft Windows Server 2016 10.0.14393.0 ~ 10.0.14393.8868 -
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.8868 -
Microsoft Windows Server 2019 10.0.17763.0 ~ 10.0.17763.8389 -
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.8389 -
Microsoft Windows Server 2022 10.0.20348.0 ~ 10.0.20348.4773 -
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 ~ 10.0.25398.2149 -
Microsoft Windows Server 2025 10.0.26100.0 ~ 10.0.26100.32370 -
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.32370 -

II. Public POCs for CVE-2026-21249

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III. Intelligence Information for CVE-2026-21249

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Same Patch Batch · Microsoft · 2026-02-10 · 54 CVEs total

CVE-2026-21531 9.8 CRITICAL Azure SDK for Python Remote Code Execution Vulnerability
CVE-2026-21510 8.8 HIGH Windows Shell Security Feature Bypass Vulnerability
CVE-2026-21537 8.8 HIGH Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability
CVE-2026-21513 8.8 HIGH MSHTML Framework Security Feature Bypass Vulnerability
CVE-2026-21518 8.8 HIGH GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability
CVE-2026-21255 8.8 HIGH Windows Hyper-V Security Feature Bypass Vulnerability
CVE-2026-21256 8.8 HIGH GitHub Copilot and Visual Studio Remote Code Execution Vulnerability
CVE-2026-21516 8.8 HIGH GitHub Copilot for Jetbrains Remote Code Execution Vulnerability
CVE-2026-21228 8.1 HIGH Azure Local Remote Code Execution Vulnerability
CVE-2026-21229 8.0 HIGH Power BI Remote Code Execution Vulnerability
CVE-2026-21257 8.0 HIGH GitHub Copilot and Visual Studio Elevation of Privilege Vulnerability
CVE-2026-21523 8.0 HIGH GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability
CVE-2026-21251 7.8 HIGH Cluster Client Failover (CCF) Elevation of Privilege Vulnerability
CVE-2026-21533 7.8 HIGH Windows Remote Desktop Services Elevation of Privilege Vulnerability
CVE-2026-21514 7.8 HIGH Microsoft Word Security Feature Bypass Vulnerability
CVE-2026-21236 7.8 HIGH Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-21238 7.8 HIGH Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-21231 7.8 HIGH Windows Kernel Elevation of Privilege Vulnerability
CVE-2026-21232 7.8 HIGH Windows HTTP.sys Elevation of Privilege Vulnerability
CVE-2026-21239 7.8 HIGH Windows Kernel Elevation of Privilege Vulnerability

Showing top 20 of 54 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1607
Same vendor: Microsoft
Same weakness: CWE-73

V. Comments for CVE-2026-21249

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