Microsoft · Security update · April 8, 2025

KB5055570: April 2025 security update

KB5055570, released April 8, 2025, fixes 42 CVEs across 2 products. One of them is being exploited (CVE-2025-29824); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now1 on CISA KEVKnown ransomware useUnsupported product

CVEs closed

3 rated Critical

Exploited

CVE-2025-29824

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.1925

97th percentile

Priority of the 42 CVEs

Patch now 1
                                Urgent 4
                                High 28
                                Routine 9

Applies to

Product
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2025-29824	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.1925	KEVRansomwareExploited
Urgent	CVE-2025-26670	Windows LDAP - Lightweight Directory Access Protocol	Remote Code Execution	8.1	0.1105	More likely
Urgent	CVE-2025-26663	Windows LDAP - Lightweight Directory Access Protocol	Remote Code Execution	8.1	0.0179	More likely
Urgent	CVE-2025-26686	Windows TCP/IP	Remote Code Execution	7.5	0.0142	Exploitation Less Likely
Urgent	CVE-2025-27727	Windows Installer	Elevation of Privilege	7.8	0.0104	More likely
High	CVE-2025-21204	Windows Update Stack	Elevation of Privilege	7.8	0.0713	Exploitation Less Likely
High	CVE-2025-27740	Windows Active Directory Certificate Services	Elevation of Privilege	8.8	0.0352	Exploitation Less Likely
High	CVE-2025-26673	Windows LDAP - Lightweight Directory Access Protocol	Denial of Service	7.5	0.0273	Exploitation Less Likely
High	CVE-2025-29810	Active Directory Domain Services	Elevation of Privilege	7.5	0.0262	Exploitation Less Likely
High	CVE-2025-27469	Windows LDAP - Lightweight Directory Access Protocol	Denial of Service	7.5	0.0257	Exploitation Less Likely
High	CVE-2025-26647	Windows Kerberos	Elevation of Privilege	8.8	0.0230	Exploitation Less Likely
High	CVE-2025-26641	Windows Cryptographic Services	Denial of Service	7.5	0.0227	Exploitation Less Likely
High	CVE-2025-27473	Windows HTTP.sys	Denial of Service	7.5	0.0227	Exploitation Less Likely
High	CVE-2025-27477	Windows Telephony Service	Remote Code Execution	8.8	0.0161	Exploitation Less Likely
High	CVE-2025-26669	Windows Routing and Remote Access Service (RRAS)	Information Disclosure	8.8	0.0153	Exploitation Less Likely
High	CVE-2025-27487	Remote Desktop Client	Remote Code Execution	8.0	0.0152	Exploitation Less Likely
High	CVE-2025-21205	Windows Telephony Service	Remote Code Execution	8.8	0.0139	Exploitation Less Likely
High	CVE-2025-21221	Windows Telephony Service	Remote Code Execution	8.8	0.0139	Exploitation Less Likely
High	CVE-2025-21222	Windows Telephony Service	Remote Code Execution	8.8	0.0139	Exploitation Less Likely
High	CVE-2025-27481	Windows Telephony Service	Remote Code Execution	8.8	0.0127	Exploitation Less Likely
High	CVE-2025-26668	Windows Routing and Remote Access Service (RRAS)	Remote Code Execution	7.5	0.0126	Exploitation Less Likely
High	CVE-2025-26671	Windows Remote Desktop Services	Remote Code Execution	8.1	0.0120	Exploitation Less Likely
High	CVE-2025-26687	Windows Win32K - GRFX	Elevation of Privilege	7.5	0.0116	Exploitation Less Likely
High	CVE-2025-27484	Windows Universal Plug and Play (UPnP) Device Host	Elevation of Privilege	7.5	0.0083	Exploitation Less Likely
High	CVE-2025-27741	Windows NTFS	Elevation of Privilege	7.8	0.0082	Exploitation Less Likely

Released the same day

KB4484432
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5002573
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5002588
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5002622
Microsoft OneNote 2016 (32-bit edition), Microsoft OneNote 2016 (64-bit edition)
KB5002623
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5002669
Microsoft Office 2016 (64-bit edition)
KB5002680
Microsoft SharePoint Server 2019, SharePoint Server Subscription Edition Language Pack
KB5002682
Microsoft SharePoint Enterprise Server 2016
KB5002691
Microsoft SharePoint Server 2019
KB5002692
Microsoft SharePoint Enterprise Server 2016
KB5002699
Office Online Server
KB5002700
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)

Vendor advisory

https://support.microsoft.com/help/5055570

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/fix/microsoft/kb5055570">KB5055570 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Which machines still need it?

Patchblox reads the OS build on every Windows machine, from Intune, ConfigMgr or its own agent, and shows which ones are still below the fixed build.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

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.