Microsoft Windows 11 25H2 vulnerabilities

CVE-2026-21255 [HIGH] CWE-284 CVE-2026-21255: Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security featur Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally.

CVE-2026-50423 [HIGH] CWE-284 CVE-2026-50423: Improper access control in Windows Kernel allows an authorized attacker to elevate privileges locall Improper access control in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVE-2025-60705 [HIGH] CWE-284 CVE-2025-60705: Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker t Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker to elevate privileges locally.

CVE-2025-59517 [HIGH] CWE-284 CVE-2025-59517: Improper access control in Windows Storage VSP Driver allows an authorized attacker to elevate privi Improper access control in Windows Storage VSP Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-33835 [HIGH] CWE-416 CVE-2026-33835: Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate pr Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-42986 [HIGH] CWE-416 CVE-2026-42986: Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges l Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.

CVE-2026-57087 [HIGH] CWE-122 CVE-2026-57087: Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.

CVE-2025-64679 [HIGH] CWE-122 CVE-2025-64679: Heap-based buffer overflow in Windows DWM Core Library allows an authorized attacker to elevate priv Heap-based buffer overflow in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.

CVE-2026-21236 [HIGH] CWE-122 CVE-2026-21236: Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized att Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-21246 [HIGH] CWE-122 CVE-2026-21246: Heap-based buffer overflow in Microsoft Graphics Component allows an authorized attacker to elevate Heap-based buffer overflow in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.

CVE-2025-59242 [HIGH] CWE-122 CVE-2025-59242: Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized att Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-50501 [HIGH] CWE-121 CVE-2026-50501: Stack-based buffer overflow in Windows Resilient File System (ReFS) allows an unauthorized attacker Stack-based buffer overflow in Windows Resilient File System (ReFS) allows an unauthorized attacker to execute code locally.

CVE-2026-50407 [HIGH] CWE-122 CVE-2026-50407: Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.

CVE-2025-59191 [HIGH] CWE-122 CVE-2025-59191: Heap-based buffer overflow in Connected Devices Platform Service (Cdpsvc) allows an authorized attac Heap-based buffer overflow in Connected Devices Platform Service (Cdpsvc) allows an authorized attacker to elevate privileges locally.

CVE-2026-45638 [HIGH] CWE-122 CVE-2026-45638: Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized att Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-49184 [HIGH] CWE-122 CVE-2026-49184: Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code locally. Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code locally.

CVE-2026-50482 [HIGH] CWE-122 CVE-2026-50482: Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally. Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.

CVE-2026-58640 [HIGH] CWE-122 CVE-2026-58640: Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally. Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.

CVE-2026-49175 [HIGH] CWE-122 CVE-2026-49175: Heap-based buffer overflow in Windows DNS allows an authorized attacker to elevate privileges locall Heap-based buffer overflow in Windows DNS allows an authorized attacker to elevate privileges locally.

CVE-2026-50309 [HIGH] CWE-122 CVE-2026-50309: Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally. Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.