Microsoft · Security update · December 9, 2025

KB5071544: December 2025 cumulative update for Windows 10 1809

KB5071544, released December 9, 2025, fixes 26 CVEs across 4 products. One of them is being exploited (CVE-2025-62221); 1 on CISA KEV. Patch Radar priority: Patch now.

Patch now1 on CISA KEV1 publicly disclosed

CVEs closed

None rated Critical

Exploited

CVE-2025-62221

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.0251

84th percentile

Priority of the 26 CVEs

Patch now 1
                                Urgent 6
                                High 17
                                Routine 2

Applies to

Product	Build after install
Windows 10 Version 1809 for 32-bit Systems	17763.8146
Windows 10 Version 1809 for x64-based Systems	17763.8146
Windows Server 2019	17763.8146
Windows Server 2019 (Server Core installation)	17763.8146

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2025-62221	Windows Cloud Files Mini Filter Driver	Elevation of Privilege	7.8	0.0251	KEVExploited
Urgent	CVE-2025-59517	Windows Storage VSP Driver	Elevation of Privilege	7.8	0.0245	More likely
Urgent	CVE-2025-59516	Windows Storage VSP Driver	Elevation of Privilege	7.8	0.0234	More likely
Urgent	CVE-2025-62454	Windows Cloud Files Mini Filter Driver	Elevation of Privilege	7.8	0.0229	More likely
Urgent	CVE-2025-62472	Windows Remote Access Connection Manager	Elevation of Privilege	7.8	0.0220	More likely
Urgent	CVE-2025-62458	Windows Win32K - GRFX	Elevation of Privilege	7.8	0.0066	More likely
Urgent	CVE-2025-62470	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.0051	More likely
High	CVE-2025-54100	Windows PowerShell	Remote Code Execution	7.8	0.0223	DisclosedExploitation Less Likely
High	CVE-2025-62549	Windows Routing and Remote Access Service (RRAS)	Remote Code Execution	8.8	0.0132	Exploitation Less Likely
High	CVE-2025-62565	Windows Shell	Elevation of Privilege	7.3	0.0057	Exploitation Less Likely
High	CVE-2025-62455	Windows Message Queuing	Elevation of Privilege	7.8	0.0047	Exploitation Less Likely
High	CVE-2025-62457	Windows Cloud Files Mini Filter Driver	Elevation of Privilege	7.8	0.0040	Exploitation Unlikely
High	CVE-2025-62466	Windows Client-Side Caching (CSC) Service	Elevation of Privilege	7.8	0.0040	Exploitation Less Likely
High	CVE-2025-55233	Windows Projected File System	Elevation of Privilege	7.8	0.0040	Exploitation Unlikely
High	CVE-2025-62461	Windows Projected File System Filter Driver	Elevation of Privilege	7.8	0.0040	Exploitation Less Likely
High	CVE-2025-62462	Windows Projected File System	Elevation of Privilege	7.8	0.0040	Exploitation Unlikely
High	CVE-2025-62464	Windows Projected File System	Elevation of Privilege	7.8	0.0040	Exploitation Less Likely
High	CVE-2025-62467	Windows Projected File System	Elevation of Privilege	7.8	0.0040	Exploitation Less Likely
High	CVE-2025-62571	Windows Installer	Elevation of Privilege	7.8	0.0040	Exploitation Less Likely
High	CVE-2025-62474	Windows Remote Access Connection Manager	Elevation of Privilege	7.8	0.0037	Exploitation Less Likely
High	CVE-2025-64673	Storvsp.sys Driver	Elevation of Privilege	7.8	0.0037	Exploitation Less Likely
High	CVE-2025-64658	Windows Shell	Elevation of Privilege	7.5	0.0031	Exploitation Less Likely
High	CVE-2025-64661	Windows Shell	Elevation of Privilege	7.8	0.0025	Exploitation Less Likely
High	CVE-2025-62573	Windows DirectX	Elevation of Privilege	7.0	0.0025	Exploitation Less Likely
Routine	CVE-2025-62473	Windows Routing and Remote Access Service (RRAS)	Information Disclosure	6.5	0.0108	Exploitation Less Likely

Released the same day

KB5002802
Microsoft SharePoint Server 2019
KB5002804
Microsoft SharePoint Enterprise Server 2016
KB5002806
Microsoft Word 2016 (32-bit edition), Microsoft Word 2016 (64-bit edition)
KB5002812
Microsoft Access 2016 (32-bit edition), Microsoft Access 2016 (64-bit edition)
KB5002815
Microsoft SharePoint Server Subscription Edition
KB5002816
Microsoft SharePoint Server 2019
KB5002817
Office Online Server
KB5002818
Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition)
KB5002820
Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition)
KB5002821
Microsoft SharePoint Enterprise Server 2016
KB5071413
Windows Server 2022, Windows Server 2022 (Server Core installation)
KB5071417
Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems

Vendor advisory

https://support.microsoft.com/help/5071544

Our write-up

December 2025 Patch Tuesday: Year Ends with Zero-Day and 1,129 CVEs for 2025

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