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CVE-2026-33099— Windows Ancillary Function Driver for WinSock Elevation of Privilege 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 Ancillary Function Driver for WinSock是美国微软（Microsoft）公司的Winsock的辅助功能驱动程序。 Microsoft Windows Ancillary Function Driver for WinSock存在资源管理错误漏洞。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

CVSS 7.0 · High EPSS 0.26% · P17

Affected Version Matrix 18

VendorProduct Version RangeStatus
Microsoft Windows 10 Version 1607 10.0.14393.0< 10.0.14393.9060 affected
Microsoft Windows 10 Version 1809 10.0.17763.0< 10.0.17763.8644 affected
Microsoft Windows 10 Version 21H2 10.0.19044.0< 10.0.19044.7184 affected
Microsoft Windows 10 Version 22H2 10.0.19045.0< 10.0.19045.7184 affected
Microsoft Windows 11 version 22H3 10.0.22631.0< 10.0.22631.6936 affected
Microsoft Windows 11 Version 23H2 10.0.22631.0< 10.0.22631.6936 affected
Microsoft Windows 11 Version 24H2 10.0.26100.0< 10.0.26100.8246 affected
Microsoft Windows 11 Version 25H2 10.0.26200.0< 10.0.26200.8246 affected
Microsoft Windows Server 2012 6.2.9200.0< 6.2.9200.26026 affected
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0< 6.2.9200.26026 affected
Microsoft Windows Server 2012 R2 6.3.9600.0< 6.3.9600.23132 affected
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0< 6.3.9600.23132 affected
Microsoft Windows Server 2016 10.0.14393.0< 10.0.14393.9060 affected
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0< 10.0.14393.9060 affected
Microsoft Windows Server 2019 10.0.17763.0< 10.0.17763.8644 affected
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0< 10.0.17763.8644 affected
Microsoft Windows Server 2022 10.0.20348.0< 10.0.20348.5020 affected
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0< 10.0.25398.2274 affected
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I. Basic Information for CVE-2026-33099

Vulnerability Information
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Vulnerability Title
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Ancillary Function Driver for WinSock 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Ancillary Function Driver for WinSock是美国微软（Microsoft）公司的Winsock的辅助功能驱动程序。 Microsoft Windows Ancillary Function Driver for WinSock存在资源管理错误漏洞。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
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 ~ 10.0.14393.9060 -
Microsoft Windows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.8644 -
Microsoft Windows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.7184 -
Microsoft Windows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.7184 -
Microsoft Windows 11 version 22H3 10.0.22631.0 ~ 10.0.22631.6936 -
Microsoft Windows 11 Version 23H2 10.0.22631.0 ~ 10.0.22631.6936 -
Microsoft Windows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.8246 -
Microsoft Windows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.8246 -
Microsoft Windows Server 2012 6.2.9200.0 ~ 6.2.9200.26026 -
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.26026 -
Microsoft Windows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.23132 -
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.23132 -
Microsoft Windows Server 2016 10.0.14393.0 ~ 10.0.14393.9060 -
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.9060 -
Microsoft Windows Server 2019 10.0.17763.0 ~ 10.0.17763.8644 -
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.8644 -
Microsoft Windows Server 2022 10.0.20348.0 ~ 10.0.20348.5020 -
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 ~ 10.0.25398.2274 -

II. Public POCs for CVE-2026-33099

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III. Intelligence Information for CVE-2026-33099

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Same Patch Batch · Microsoft · 2026-04-14 · 163 CVEs total

CVE-2026-33824 9.8 CRITICAL Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability
CVE-2026-26149 9.0 CRITICAL Microsoft Power Apps Desktop Client Spoofing Vulnerability
CVE-2026-26178 8.8 HIGH Windows Advanced Rasterization Platform Elevation of Privilege Vulnerability
CVE-2026-33120 8.8 HIGH Microsoft SQL Server Remote Code Execution Vulnerability
CVE-2026-32157 8.8 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-32171 8.8 HIGH Azure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-32225 8.8 HIGH Windows Shell Security Feature Bypass Vulnerability
CVE-2026-26167 8.8 HIGH Windows Push Notifications Elevation of Privilege Vulnerability
CVE-2026-27928 8.7 HIGH Windows Hello Security Feature Bypass Vulnerability
CVE-2026-32162 8.4 HIGH Windows COM Elevation of Privilege Vulnerability
CVE-2026-32190 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-33114 8.4 HIGH Microsoft Word Remote Code Execution Vulnerability
CVE-2026-32091 8.4 HIGH Microsoft Brokering File System Elevation of Privilege Vulnerability
CVE-2026-32221 8.4 HIGH Windows Graphics Component Remote Code Execution Vulnerability
CVE-2026-33115 8.4 HIGH Microsoft Word Remote Code Execution Vulnerability
CVE-2026-33827 8.1 HIGH Windows TCP/IP Remote Code Execution Vulnerability
CVE-2026-27912 8.0 HIGH Windows Kerberos Elevation of Privilege Vulnerability
CVE-2026-33826 8.0 HIGH Windows Active Directory Remote Code Execution Vulnerability
CVE-2026-33098 7.8 HIGH Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability
CVE-2026-33825 7.8 HIGH Microsoft Defender Elevation of Privilege Vulnerability

Showing top 20 of 163 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1607
Same vendor: Microsoft
Same weakness: CWE-416

V. Comments for CVE-2026-33099

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