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CVE-2026-21525— Windows Remote Access Connection Manager Denial of Service Vulnerability

Quick assessment

Affected
Microsoft Windows 10 Version 1607
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 Windows Remote Access Connection Manager是美国微软（Microsoft）公司的一项 Windows 服务，用于管理从您的计算机到 Internet 的虚拟专用网络 (VPN)连接，如果禁用此服务，VPN 客户端应用程序将无法启动。 Microsoft Windows Remote Access Connection Manager存在安全漏洞。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 1809

CVSS 6.2 · Medium KEV EPSS 4.83% · P92

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 22

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 6.2.9200.0< 6.2.9200.25923 affected
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0< 6.2.9200.25923 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-2026-21525

Vulnerability Information
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Vulnerability Title
Windows Remote Access Connection Manager Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Remote Access Connection Manager 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Remote Access Connection Manager是美国微软（Microsoft）公司的一项 Windows 服务，用于管理从您的计算机到 Internet 的虚拟专用网络 (VPN)连接，如果禁用此服务，VPN 客户端应用程序将无法启动。 Microsoft Windows Remote Access Connection Manager存在安全漏洞。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 1809
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)

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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 6.2.9200.0 ~ 6.2.9200.25923 -
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.25923 -
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-2026-21525

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III. Intelligence Information for CVE-2026-21525

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Vendor Advisories for CVE-2026-21525 (1)

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-2026-21516 8.8 HIGH GitHub Copilot for Jetbrains Remote Code Execution Vulnerability
CVE-2026-21256 8.8 HIGH GitHub Copilot and Visual Studio 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-2026-21250 7.8 HIGH Windows HTTP.sys 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-2026-21251 7.8 HIGH Cluster Client Failover (CCF) 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-476

V. Comments for CVE-2026-21525

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