Microsoft · Security update · December 18, 2025

KB5074353: December 2025 security update

KB5074353, released December 18, 2025, fixes 1 CVE across 2 products. None of them is reported as exploited. Patch Radar priority: High.

High1 publicly disclosed

CVEs closed

None rated Critical

Exploited

None reported

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.0223

82nd percentile

Applies to

Product
Windows Server 2022
Windows Server 2022 (Server Core installation)

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
High	CVE-2025-54100	Windows PowerShell	Remote Code Execution	7.8	0.0223	DisclosedExploitation Less Likely

Released the same day

KB5074204
Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 3 more

Vendor advisory

https://support.microsoft.com/help/5074353

Our write-up

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

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