# KB5063709: August 2025 cumulative update for Windows 10 21H2 KB5063709, released August 12, 2025, fixes 44 CVEs across 6 products. None of them is reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/fix/microsoft/kb5063709 - Platform: Microsoft - Released: Aug 12, 2025 - Priority: Urgent (Closes CVE-2025-53778, exploitation more likely) - CVEs: 44, exploited: 0, on CISA KEV: 0 - Vendor advisory: https://support.microsoft.com/help/5063709 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Windows 10 Version 21H2 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-21h2-for-32-bit-systems.md) | | | | [Windows 10 Version 21H2 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-21h2-for-arm64-based-systems.md) | | | | [Windows 10 Version 21H2 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-21h2-for-x64-based-systems.md) | | | | [Windows 10 Version 22H2 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-22h2-for-32-bit-systems.md) | | | | [Windows 10 Version 22H2 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-22h2-for-arm64-based-systems.md) | | | | [Windows 10 Version 22H2 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-22h2-for-x64-based-systems.md) | | | ## CVEs this fix closes | CVE | Priority | Component | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2025-53778](https://patchblox.com/security/data/cve/CVE-2025-53778.md) | Urgent | Windows NTLM | 8.8 | 0.5162 | More likely | | [CVE-2025-53766](https://patchblox.com/security/data/cve/CVE-2025-53766.md) | Urgent | Windows GDI+ | 9.8 | 0.0846 | | | [CVE-2025-50177](https://patchblox.com/security/data/cve/CVE-2025-50177.md) | Urgent | Windows Message Queuing | 8.1 | 0.0461 | More likely | | [CVE-2025-49743](https://patchblox.com/security/data/cve/CVE-2025-49743.md) | Urgent | Microsoft Graphics Component | 6.7 | 0.0053 | More likely | | [CVE-2025-53132](https://patchblox.com/security/data/cve/CVE-2025-53132.md) | Urgent | Windows Win32K - GRFX | 7.8 | 0.0046 | More likely | | [CVE-2025-53147](https://patchblox.com/security/data/cve/CVE-2025-53147.md) | Urgent | Windows Ancillary Function Driver for WinSock | 7.0 | 0.0045 | More likely | | [CVE-2025-50167](https://patchblox.com/security/data/cve/CVE-2025-50167.md) | Urgent | Role: Windows Hyper-V | 7.0 | 0.0038 | More likely | | [CVE-2025-53722](https://patchblox.com/security/data/cve/CVE-2025-53722.md) | High | Windows Remote Desktop Services | 7.5 | 0.2342 | | | [CVE-2025-53143](https://patchblox.com/security/data/cve/CVE-2025-53143.md) | High | Windows Message Queuing | 8.8 | 0.0903 | | | [CVE-2025-53144](https://patchblox.com/security/data/cve/CVE-2025-53144.md) | High | Windows Message Queuing | 8.8 | 0.0849 | | | [CVE-2025-53145](https://patchblox.com/security/data/cve/CVE-2025-53145.md) | High | Windows Message Queuing | 8.8 | 0.0849 | | | [CVE-2025-50171](https://patchblox.com/security/data/cve/CVE-2025-50171.md) | High | Remote Desktop Server | 9.1 | 0.0104 | | | [CVE-2025-53131](https://patchblox.com/security/data/cve/CVE-2025-53131.md) | High | Windows Media | 8.8 | 0.0097 | | | [CVE-2025-53149](https://patchblox.com/security/data/cve/CVE-2025-53149.md) | High | Kernel Streaming WOW Thunk Service Driver | 7.8 | 0.0077 | | | [CVE-2025-50161](https://patchblox.com/security/data/cve/CVE-2025-50161.md) | High | Windows Win32K - GRFX | 7.3 | 0.0060 | | | [CVE-2025-50159](https://patchblox.com/security/data/cve/CVE-2025-50159.md) | High | Remote Access Point-to-Point Protocol (PPP) EAP-TLS | 7.3 | 0.0059 | | | [CVE-2025-50173](https://patchblox.com/security/data/cve/CVE-2025-50173.md) | High | Windows Installer | 7.8 | 0.0055 | | | [CVE-2025-53155](https://patchblox.com/security/data/cve/CVE-2025-53155.md) | High | Role: Windows Hyper-V | 7.8 | 0.0049 | | | [CVE-2025-53723](https://patchblox.com/security/data/cve/CVE-2025-53723.md) | High | Role: Windows Hyper-V | 7.8 | 0.0049 | | | [CVE-2025-53152](https://patchblox.com/security/data/cve/CVE-2025-53152.md) | High | Desktop Windows Manager | 7.8 | 0.0045 | | | [CVE-2025-53724](https://patchblox.com/security/data/cve/CVE-2025-53724.md) | High | Windows Push Notifications | 7.8 | 0.0045 | | | [CVE-2025-53726](https://patchblox.com/security/data/cve/CVE-2025-53726.md) | High | Windows Push Notifications | 7.8 | 0.0045 | | | [CVE-2025-49761](https://patchblox.com/security/data/cve/CVE-2025-49761.md) | High | Windows Kernel | 7.8 | 0.0044 | | | [CVE-2025-50153](https://patchblox.com/security/data/cve/CVE-2025-50153.md) | High | Desktop Windows Manager | 7.8 | 0.0044 | | | [CVE-2025-50155](https://patchblox.com/security/data/cve/CVE-2025-50155.md) | High | Windows Push Notifications | 7.8 | 0.0044 | | | [CVE-2025-53141](https://patchblox.com/security/data/cve/CVE-2025-53141.md) | High | Windows Ancillary Function Driver for WinSock | 7.8 | 0.0044 | | | [CVE-2025-53151](https://patchblox.com/security/data/cve/CVE-2025-53151.md) | High | Windows Kernel | 7.8 | 0.0044 | | | [CVE-2025-53154](https://patchblox.com/security/data/cve/CVE-2025-53154.md) | High | Windows Ancillary Function Driver for WinSock | 7.8 | 0.0044 | | | [CVE-2025-53725](https://patchblox.com/security/data/cve/CVE-2025-53725.md) | High | Windows Push Notifications | 7.8 | 0.0044 | | | [CVE-2025-50170](https://patchblox.com/security/data/cve/CVE-2025-50170.md) | High | Windows Cloud Files Mini Filter Driver | 7.8 | 0.0040 | | | [CVE-2025-53137](https://patchblox.com/security/data/cve/CVE-2025-53137.md) | High | Windows Ancillary Function Driver for WinSock | 7.0 | 0.0039 | | | [CVE-2025-50158](https://patchblox.com/security/data/cve/CVE-2025-50158.md) | High | Windows NTFS | 7.0 | 0.0039 | | | [CVE-2025-53718](https://patchblox.com/security/data/cve/CVE-2025-53718.md) | High | Windows Ancillary Function Driver for WinSock | 7.0 | 0.0036 | | | [CVE-2025-53140](https://patchblox.com/security/data/cve/CVE-2025-53140.md) | High | Kernel Transaction Manager | 7.0 | 0.0036 | | | [CVE-2025-53721](https://patchblox.com/security/data/cve/CVE-2025-53721.md) | High | Windows Connected Devices Platform Service | 7.0 | 0.0036 | | | [CVE-2025-53134](https://patchblox.com/security/data/cve/CVE-2025-53134.md) | High | Windows Ancillary Function Driver for WinSock | 7.0 | 0.0032 | | | [CVE-2025-49762](https://patchblox.com/security/data/cve/CVE-2025-49762.md) | High | Windows Ancillary Function Driver for WinSock | 7.0 | 0.0027 | | | [CVE-2025-53135](https://patchblox.com/security/data/cve/CVE-2025-53135.md) | High | Windows DirectX | 7.0 | 0.0027 | | | [CVE-2025-50154](https://patchblox.com/security/data/cve/CVE-2025-50154.md) | Routine | Windows File Explorer | 6.5 | 0.3177 | | | [CVE-2025-50172](https://patchblox.com/security/data/cve/CVE-2025-50172.md) | Routine | Windows DirectX | 6.5 | 0.0155 | | | [CVE-2025-53716](https://patchblox.com/security/data/cve/CVE-2025-53716.md) | Routine | Windows Local Security Authority Subsystem Service (LSASS) | 6.5 | 0.0155 | | | [CVE-2025-50166](https://patchblox.com/security/data/cve/CVE-2025-50166.md) | Routine | Windows Distributed Transaction Coordinator | 6.5 | 0.0141 | | | [CVE-2025-53136](https://patchblox.com/security/data/cve/CVE-2025-53136.md) | Routine | Windows NT OS Kernel | 5.5 | 0.0098 | | | [CVE-2025-49751](https://patchblox.com/security/data/cve/CVE-2025-49751.md) | Routine | Role: Windows Hyper-V | 6.8 | 0.0054 | | --- Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.