Microsoft · Security update · April 8, 2025

KB5055557: April 2025 security update

KB5055557, released April 8, 2025, fixes 54 CVEs across 2 products. One of them is being exploited (CVE-2025-29824); 1 on CISA KEV. Patch Radar priority: Patch now.

Patch now1 on CISA KEVKnown ransomware use

CVEs closed

4 rated Critical

Exploited

CVE-2025-29824

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.1925

97th percentile

Priority of the 54 CVEs

Patch now 1
                                Urgent 6
                                High 36
                                Routine 11

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
Patch now	CVE-2025-29824	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.1925	KEVRansomwareExploited
Urgent	CVE-2025-27480	Remote Desktop Gateway Service	Remote Code Execution	8.1	0.1262	More likely
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-2025-27472	Windows Mark of the Web (MOTW)	Security Feature Bypass	5.4	0.0154	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-2025-26652	Windows Standards-Based Storage Management Service	Denial of Service	7.5	0.0235	Exploitation Less Likely
High	CVE-2025-27470	Windows Standards-Based Storage Management Service	Denial of Service	7.5	0.0235	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-2025-27479	Windows Kerberos	Denial of Service	7.5	0.0227	Exploitation Less Likely
High	CVE-2025-27485	Windows Standards-Based Storage Management Service	Denial of Service	7.5	0.0216	Exploitation Less Likely
High	CVE-2025-27486	Windows Standards-Based Storage Management Service	Denial of Service	7.5	0.0216	Exploitation Less Likely
High	CVE-2025-26680	Windows Standards-Based Storage Management Service	Denial of Service	7.5	0.0204	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

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/5055557

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