# KB5055519: April 2025 cumulative update for Windows 10 1809 KB5055519, released April 8, 2025, fixes 75 CVEs across 4 products. One of them is being exploited (CVE-2025-29824); 1 on CISA KEV. Patch Radar priority: Patch now. - Web page: https://patchblox.com/security/fix/microsoft/kb5055519 - 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/5055519 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Windows 10 Version 1809 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1809-for-32-bit-systems.md) | | 17763.7136 | | [Windows 10 Version 1809 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1809-for-x64-based-systems.md) | | 17763.7136 | | [Windows Server 2019](https://patchblox.com/security/data/product/microsoft/windows-server-2019.md) | | 17763.7136 | | [Windows Server 2019 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2019-server-core-installation.md) | | 17763.7136 | ## 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-2025-21204](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-2025-26652](https://patchblox.com/security/data/cve/CVE-2025-26652.md) | High | Windows Standards-Based Storage Management Service | 7.5 | 0.0235 | | | [CVE-2025-27470](https://patchblox.com/security/data/cve/CVE-2025-27470.md) | High | Windows Standards-Based Storage Management Service | 7.5 | 0.0235 | | | [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-2025-21174](https://patchblox.com/security/data/cve/CVE-2025-21174.md) | High | Windows Standards-Based Storage Management Service | 7.5 | 0.0218 | | | [CVE-2025-27485](https://patchblox.com/security/data/cve/CVE-2025-27485.md) | High | Windows Standards-Based Storage Management Service | 7.5 | 0.0216 | | | [CVE-2025-27486](https://patchblox.com/security/data/cve/CVE-2025-27486.md) | High | Windows Standards-Based Storage Management Service | 7.5 | 0.0216 | | | [CVE-2025-26680](https://patchblox.com/security/data/cve/CVE-2025-26680.md) | High | Windows Standards-Based Storage Management Service | 7.5 | 0.0204 | | | [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-2025-27741](https://patchblox.com/security/data/cve/CVE-2025-27741.md) | High | Windows NTFS | 7.8 | 0.0082 | | | [CVE-2025-27737](https://patchblox.com/security/data/cve/CVE-2025-27737.md) | High | Windows Security Zone Mapping | 8.6 | 0.0078 | | | [CVE-2025-27483](https://patchblox.com/security/data/cve/CVE-2025-27483.md) | High | Windows NTFS | 7.8 | 0.0077 | | | [CVE-2025-27733](https://patchblox.com/security/data/cve/CVE-2025-27733.md) | High | Windows NTFS | 7.8 | 0.0074 | | | [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-2025-24073](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-2025-26679](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-2025-26678](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-2025-27732](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-2025-26664](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-2025-26644](https://patchblox.com/security/data/cve/CVE-2025-26644.md) | Routine | Windows Hello | 5.1 | 0.0056 | | | [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 2026-11-08T06:59:42Z 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.