Microsoft · Security update · April 11, 2025

KB5056456: April 2025 security update

KB5056456, released April 11, 2025, fixes 1 CVE across 2 products. None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.0218

82nd percentile

Applies to

Product
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
High	CVE-2025-21174	Windows Standards-Based Storage Management Service	Denial of Service	7.5	0.0218	Exploitation Less Likely

Also fixes CVE-2025-21174

KB5055523
Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows Server 2025 and 1 more
KB5055526
Azure Stack HCI OS 22H2, Windows Server 2022, Windows Server 2022 (Server Core installation)
KB5055519
Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 1 more
KB5055521
Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016 and 1 more

Vendor advisory

https://support.microsoft.com/help/5056456

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