Microsoft · ServicingStack update · December 9, 2025

KB5071542: December 2025 cumulative update for Windows Server 23H2

KB5071542, released December 9, 2025, fixes 30 CVEs in Windows Server 2022, 23H2 Edition (Server Core installation) (build 25398.2025). One of them is being exploited (CVE-2025-62221); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now1 on CISA KEV1 publicly disclosedUnsupported product

CVEs closed

None rated Critical

Exploited

CVE-2025-62221

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.0263

85th percentile

Priority of the 30 CVEs

Patch now 1
                                Urgent 6
                                High 18
                                Routine 5

Applies to

Product	Build after install
Windows Server 2022, 23H2 Edition (Server Core installation)	25398.2025

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	0.0263	More likely
Urgent	CVE-2025-59516	Windows Storage VSP Driver	Elevation of Privilege	7.8	0.0251	More likely
Urgent	CVE-2025-62454	Windows Cloud Files Mini Filter Driver	Elevation of Privilege	7.8	0.0246	More likely
Urgent	CVE-2025-62472	Windows Remote Access Connection Manager	Elevation of Privilege	7.8	0.0236	More likely
Urgent	CVE-2025-62470	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.0054	More likely
Urgent	CVE-2025-62468	Windows Defender Firewall Service	Information Disclosure	5.5	0.0054	More likely
High	CVE-2025-54100	Windows PowerShell	Remote Code Execution	7.8	0.0166	DisclosedExploitation Less Likely
High	CVE-2025-62549	Windows Routing and Remote Access Service (RRAS)	Remote Code Execution	8.8	0.0141	Exploitation Less Likely
High	CVE-2025-62456	Windows Resilient File System (ReFS)	Remote Code Execution	8.8	0.0119	Exploitation Unlikely
High	CVE-2025-62565	Windows Shell	Elevation of Privilege	7.3	0.0061	Exploitation Less Likely
High	CVE-2025-62457	Windows Cloud Files Mini Filter Driver	Elevation of Privilege	7.8	0.0043	Exploitation Unlikely
High	CVE-2025-62466	Windows Client-Side Caching (CSC) Service	Elevation of Privilege	7.8	0.0043	Exploitation Less Likely
High	CVE-2025-55233	Windows Projected File System	Elevation of Privilege	7.8	0.0043	Exploitation Unlikely
High	CVE-2025-62461	Windows Projected File System Filter Driver	Elevation of Privilege	7.8	0.0043	Exploitation Less Likely
High	CVE-2025-62462	Windows Projected File System	Elevation of Privilege	7.8	0.0043	Exploitation Unlikely
High	CVE-2025-62464	Windows Projected File System	Elevation of Privilege	7.8	0.0043	Exploitation Less Likely
High	CVE-2025-62467	Windows Projected File System	Elevation of Privilege	7.8	0.0043	Exploitation Less Likely
High	CVE-2025-62571	Windows Installer	Elevation of Privilege	7.8	0.0043	Exploitation Less Likely
High	CVE-2025-62474	Windows Remote Access Connection Manager	Elevation of Privilege	7.8	0.0039	Exploitation Less Likely
High	CVE-2025-64673	Storvsp.sys Driver	Elevation of Privilege	7.8	0.0039	Exploitation Less Likely
High	CVE-2025-62569	Microsoft Brokering File System	Elevation of Privilege	7.0	0.0035	Exploitation Less Likely
High	CVE-2025-64658	Windows Shell	Elevation of Privilege	7.5	0.0033	Exploitation Less Likely
High	CVE-2025-64661	Windows Shell	Elevation of Privilege	7.8	0.0027	Exploitation Less Likely
High	CVE-2025-62573	Windows DirectX	Elevation of Privilege	7.0	0.0026	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/5071542

Our write-up

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

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