# KB5055527: April 2025 cumulative update for Windows Server 23H2 KB5055527, released April 8, 2025, fixes 75 CVEs in Windows Server 2022, 23H2 Edition (Server Core installation) (build 25398.1551). One of them is being exploited (CVE-2025-29824); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported. - Web page: https://patchblox.com/security/fix/microsoft/kb5055527 - Platform: Microsoft - Released: Apr 8, 2025 - Priority: Patch now (Closes CVE-2025-29824, exploited (CISA KEV, ransomware)) - CVEs: 75, exploited: 1, on CISA KEV: 1 - Vendor advisory: https://support.microsoft.com/help/5055527 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Windows Server 2022, 23H2 Edition (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2022-23h2-edition-server-core-installation.md) | | 25398.1551 | ## CVEs this fix closes | CVE | Priority | Component | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2025-29824](https://patchblox.com/security/data/cve/CVE-2025-29824.md) | Patch now | Windows Common Log File System Driver | 7.8 | 0.1925 | CISA KEV, Ransomware | | [CVE-2025-27480](https://patchblox.com/security/data/cve/CVE-2025-27480.md) | Urgent | Remote Desktop Gateway Service | 8.1 | 0.1262 | More likely | | [CVE-2025-26670](https://patchblox.com/security/data/cve/CVE-2025-26670.md) | Urgent | Windows LDAP - Lightweight Directory Access Protocol | 8.1 | 0.1105 | More likely | | [CVE-2025-29809](https://patchblox.com/security/data/cve/CVE-2025-29809.md) | Urgent | Windows Kerberos | 7.1 | 0.0426 | More likely | | [CVE-2025-26663](https://patchblox.com/security/data/cve/CVE-2025-26663.md) | Urgent | Windows LDAP - Lightweight Directory Access Protocol | 8.1 | 0.0179 | More likely | | [CVE-2025-27482](https://patchblox.com/security/data/cve/CVE-2025-27482.md) | Urgent | Remote Desktop Gateway Service | 8.1 | 0.0165 | More likely | | [CVE-2025-27491](https://patchblox.com/security/data/cve/CVE-2025-27491.md) | Urgent | Windows Hyper-V | 7.1 | 0.0143 | | | [CVE-2025-26686](https://patchblox.com/security/data/cve/CVE-2025-26686.md) | Urgent | Windows TCP/IP | 7.5 | 0.0142 | | | [CVE-2025-27727](https://patchblox.com/security/data/cve/CVE-2025-27727.md) | Urgent | Windows Installer | 7.8 | 0.0104 | More likely | | [CVE-2025-29812](https://patchblox.com/security/data/cve/CVE-2025-29812.md) | Urgent | Windows Kernel Memory | 7.8 | 0.0093 | More likely | | [CVE-2025-21204](https://patchblox.com/security/data/cve/CVE-2025-21204.md) | High | Windows Update Stack | 7.8 | 0.0713 | | | [CVE-2025-27740](https://patchblox.com/security/data/cve/CVE-2025-27740.md) | High | Windows Active Directory Certificate Services | 8.8 | 0.0352 | | | [CVE-2025-26673](https://patchblox.com/security/data/cve/CVE-2025-26673.md) | High | Windows LDAP - Lightweight Directory Access Protocol | 7.5 | 0.0273 | | | [CVE-2025-29810](https://patchblox.com/security/data/cve/CVE-2025-29810.md) | High | Active Directory Domain Services | 7.5 | 0.0262 | | | [CVE-2025-27469](https://patchblox.com/security/data/cve/CVE-2025-27469.md) | High | Windows LDAP - Lightweight Directory Access Protocol | 7.5 | 0.0257 | | | [CVE-2025-26647](https://patchblox.com/security/data/cve/CVE-2025-26647.md) | High | Windows Kerberos | 8.8 | 0.0230 | | | [CVE-2025-26641](https://patchblox.com/security/data/cve/CVE-2025-26641.md) | High | Windows Cryptographic Services | 7.5 | 0.0227 | | | [CVE-2025-27473](https://patchblox.com/security/data/cve/CVE-2025-27473.md) | High | Windows HTTP.sys | 7.5 | 0.0227 | | | [CVE-2025-27479](https://patchblox.com/security/data/cve/CVE-2025-27479.md) | High | Windows Kerberos | 7.5 | 0.0227 | | | [CVE-2025-27477](https://patchblox.com/security/data/cve/CVE-2025-27477.md) | High | Windows Telephony Service | 8.8 | 0.0161 | | | [CVE-2025-26669](https://patchblox.com/security/data/cve/CVE-2025-26669.md) | High | Windows Routing and Remote Access Service (RRAS) | 8.8 | 0.0153 | | | [CVE-2025-27487](https://patchblox.com/security/data/cve/CVE-2025-27487.md) | High | Remote Desktop Client | 8.0 | 0.0152 | | | [CVE-2025-21205](https://patchblox.com/security/data/cve/CVE-2025-21205.md) | High | Windows Telephony Service | 8.8 | 0.0139 | | | [CVE-2025-21221](https://patchblox.com/security/data/cve/CVE-2025-21221.md) | High | Windows Telephony Service | 8.8 | 0.0139 | | | [CVE-2025-21222](https://patchblox.com/security/data/cve/CVE-2025-21222.md) | High | Windows Telephony Service | 8.8 | 0.0139 | | | [CVE-2025-27481](https://patchblox.com/security/data/cve/CVE-2025-27481.md) | High | Windows Telephony Service | 8.8 | 0.0127 | | | [CVE-2025-26668](https://patchblox.com/security/data/cve/CVE-2025-26668.md) | High | Windows Routing and Remote Access Service (RRAS) | 7.5 | 0.0126 | | | [CVE-2025-26671](https://patchblox.com/security/data/cve/CVE-2025-26671.md) | High | Windows Remote Desktop Services | 8.1 | 0.0120 | | | [CVE-2025-26687](https://patchblox.com/security/data/cve/CVE-2025-26687.md) | High | Windows Win32K - GRFX | 7.5 | 0.0116 | | | [CVE-2025-27484](https://patchblox.com/security/data/cve/CVE-2025-27484.md) | High | Windows Universal Plug and Play (UPnP) Device Host | 7.5 | 0.0083 | | | [CVE-2025-27737](https://patchblox.com/security/data/cve/CVE-2025-27737.md) | High | Windows Security Zone Mapping | 8.6 | 0.0078 | | | [CVE-2025-26666](https://patchblox.com/security/data/cve/CVE-2025-26666.md) | High | Windows Media | 7.8 | 0.0064 | | | [CVE-2025-26674](https://patchblox.com/security/data/cve/CVE-2025-26674.md) | High | Windows Media | 7.8 | 0.0064 | | | [CVE-2025-27467](https://patchblox.com/security/data/cve/CVE-2025-27467.md) | High | Windows Digital Media | 7.8 | 0.0064 | | | [CVE-2025-27476](https://patchblox.com/security/data/cve/CVE-2025-27476.md) | High | Windows Digital Media | 7.8 | 0.0064 | | | [CVE-2025-27730](https://patchblox.com/security/data/cve/CVE-2025-27730.md) | High | Windows Digital Media | 7.8 | 0.0064 | | | [CVE-2025-27731](https://patchblox.com/security/data/cve/CVE-2025-27731.md) | High | OpenSSH for Windows | 7.8 | 0.0064 | | | [CVE-2025-27739](https://patchblox.com/security/data/cve/CVE-2025-27739.md) | High | Windows Kernel | 7.8 | 0.0064 | | | [CVE-2025-24058](https://patchblox.com/security/data/cve/CVE-2025-24058.md) | High | Windows DWM Core Library | 7.8 | 0.0061 | | | [CVE-2025-24060](https://patchblox.com/security/data/cve/CVE-2025-24060.md) | High | Windows DWM Core Library | 7.8 | 0.0061 | | | [CVE-2025-24062](https://patchblox.com/security/data/cve/CVE-2025-24062.md) | High | Windows DWM Core Library | 7.8 | 0.0061 | | | [CVE-2025-24073](https://patchblox.com/security/data/cve/CVE-2025-24073.md) | High | Windows DWM Core Library | 7.8 | 0.0061 | | | [CVE-2025-24074](https://patchblox.com/security/data/cve/CVE-2025-24074.md) | High | Windows DWM Core Library | 7.8 | 0.0061 | | | [CVE-2025-27490](https://patchblox.com/security/data/cve/CVE-2025-27490.md) | High | Windows Bluetooth Service | 7.8 | 0.0061 | | | [CVE-2025-29811](https://patchblox.com/security/data/cve/CVE-2025-29811.md) | High | Windows Mobile Broadband | 7.8 | 0.0060 | | | [CVE-2025-26675](https://patchblox.com/security/data/cve/CVE-2025-26675.md) | High | Windows Subsystem for Linux | 7.8 | 0.0060 | | | [CVE-2025-26679](https://patchblox.com/security/data/cve/CVE-2025-26679.md) | High | RPC Endpoint Mapper Service | 7.8 | 0.0059 | | | [CVE-2025-26688](https://patchblox.com/security/data/cve/CVE-2025-26688.md) | High | Microsoft Virtual Hard Drive | 7.8 | 0.0058 | | | [CVE-2025-26639](https://patchblox.com/security/data/cve/CVE-2025-26639.md) | High | Windows USB Print Driver | 7.8 | 0.0057 | | | [CVE-2025-26678](https://patchblox.com/security/data/cve/CVE-2025-26678.md) | High | Windows Defender Application Control (WDAC) | 8.4 | 0.0054 | | | [CVE-2025-26648](https://patchblox.com/security/data/cve/CVE-2025-26648.md) | High | Windows Kernel | 7.8 | 0.0048 | | | [CVE-2025-26640](https://patchblox.com/security/data/cve/CVE-2025-26640.md) | High | Windows Digital Media | 7.0 | 0.0048 | | | [CVE-2025-27478](https://patchblox.com/security/data/cve/CVE-2025-27478.md) | High | Windows Local Security Authority (LSA) | 7.0 | 0.0046 | | | [CVE-2025-26649](https://patchblox.com/security/data/cve/CVE-2025-26649.md) | High | Windows Secure Channel | 7.0 | 0.0039 | | | [CVE-2025-27492](https://patchblox.com/security/data/cve/CVE-2025-27492.md) | High | Windows Secure Channel | 7.0 | 0.0035 | | | [CVE-2025-27732](https://patchblox.com/security/data/cve/CVE-2025-27732.md) | High | Windows Win32K - GRFX | 7.0 | 0.0035 | | | [CVE-2025-26665](https://patchblox.com/security/data/cve/CVE-2025-26665.md) | High | Windows upnphost.dll | 7.0 | 0.0034 | | | [CVE-2025-21191](https://patchblox.com/security/data/cve/CVE-2025-21191.md) | High | Windows Local Security Authority (LSA) | 7.0 | 0.0032 | | | [CVE-2025-27738](https://patchblox.com/security/data/cve/CVE-2025-27738.md) | Routine | Windows Resilient File System (ReFS) | 6.5 | 0.0357 | | | [CVE-2025-21197](https://patchblox.com/security/data/cve/CVE-2025-21197.md) | Routine | Windows NTFS | 6.5 | 0.0332 | | | [CVE-2025-26651](https://patchblox.com/security/data/cve/CVE-2025-26651.md) | Routine | Windows Local Session Manager (LSM) | 6.5 | 0.0261 | | | [CVE-2025-26664](https://patchblox.com/security/data/cve/CVE-2025-26664.md) | Routine | Windows Routing and Remote Access Service (RRAS) | 6.5 | 0.0185 | | | [CVE-2025-26667](https://patchblox.com/security/data/cve/CVE-2025-26667.md) | Routine | Windows Routing and Remote Access Service (RRAS) | 6.5 | 0.0185 | | | [CVE-2025-26672](https://patchblox.com/security/data/cve/CVE-2025-26672.md) | Routine | Windows Routing and Remote Access Service (RRAS) | 6.5 | 0.0185 | | | [CVE-2025-27474](https://patchblox.com/security/data/cve/CVE-2025-27474.md) | Routine | Windows Routing and Remote Access Service (RRAS) | 6.5 | 0.0185 | | | [CVE-2025-21203](https://patchblox.com/security/data/cve/CVE-2025-21203.md) | Routine | Windows Routing and Remote Access Service (RRAS) | 6.5 | 0.0169 | | | [CVE-2025-26676](https://patchblox.com/security/data/cve/CVE-2025-26676.md) | Routine | Windows Routing and Remote Access Service (RRAS) | 6.5 | 0.0166 | | | [CVE-2024-21302](https://patchblox.com/security/data/cve/CVE-2024-21302.md) | Routine | Windows Secure Kernel Mode | 6.7 | 0.0157 | Disclosed | | [CVE-2025-26635](https://patchblox.com/security/data/cve/CVE-2025-26635.md) | Routine | Windows Hello | 6.5 | 0.0153 | | | [CVE-2025-27471](https://patchblox.com/security/data/cve/CVE-2025-27471.md) | Routine | Microsoft Streaming Service | 5.9 | 0.0132 | | | [CVE-2025-27736](https://patchblox.com/security/data/cve/CVE-2025-27736.md) | Routine | Windows Power Dependency Coordinator | 5.5 | 0.0094 | | | [CVE-2025-27742](https://patchblox.com/security/data/cve/CVE-2025-27742.md) | Routine | Windows NTFS | 5.5 | 0.0088 | | | [CVE-2025-26637](https://patchblox.com/security/data/cve/CVE-2025-26637.md) | Routine | Windows BitLocker | 6.8 | 0.0086 | | | [CVE-2025-26681](https://patchblox.com/security/data/cve/CVE-2025-26681.md) | Routine | Windows Win32K - GRFX | 6.7 | 0.0058 | | | [CVE-2025-27735](https://patchblox.com/security/data/cve/CVE-2025-27735.md) | Routine | Windows Virtualization-Based Security (VBS) Enclave | 6.0 | 0.0041 | | --- Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data 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.