# KB5051987: February 2025 cumulative update for Windows Server 23H2 KB5051987, released February 11, 2025, fixes 39 CVEs across 4 products. 3 of them are being exploited (CVE-2025-21391); 2 on CISA KEV. Patch Radar priority: Patch now. - Web page: https://patchblox.com/security/fix/microsoft/kb5051987 - Platform: Microsoft - Released: Feb 11, 2025 - Priority: Patch now (Closes CVE-2025-21391, exploited (CISA KEV)) - CVEs: 39, exploited: 3, on CISA KEV: 2 - Vendor advisory: https://support.microsoft.com/help/5051987 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Windows 11 Version 24H2 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-11-version-24h2-for-arm64-based-systems.md) | | 26100.3194 | | [Windows 11 Version 24H2 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-11-version-24h2-for-x64-based-systems.md) | | 26100.3194 | | [Windows Server 2025](https://patchblox.com/security/data/product/microsoft/windows-server-2025.md) | | 26100.3194 | | [Windows Server 2025 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2025-server-core-installation.md) | | 26100.3194 | ## CVEs this fix closes | CVE | Priority | Component | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2023-24932](https://patchblox.com/security/data/cve/CVE-2023-24932.md) | Patch now | Windows Secure Boot | 6.7 | 0.1182 | Exploited, Disclosed | | [CVE-2025-21391](https://patchblox.com/security/data/cve/CVE-2025-21391.md) | Patch now | Windows Storage | 7.1 | 0.0228 | CISA KEV | | [CVE-2025-21418](https://patchblox.com/security/data/cve/CVE-2025-21418.md) | Patch now | Windows Ancillary Function Driver for WinSock | 7.8 | 0.0213 | CISA KEV | | [CVE-2025-21377](https://patchblox.com/security/data/cve/CVE-2025-21377.md) | Urgent | Windows NTLM | 6.5 | 0.3993 | Disclosed | | [CVE-2025-21376](https://patchblox.com/security/data/cve/CVE-2025-21376.md) | Urgent | Windows LDAP - Lightweight Directory Access Protocol | 8.1 | 0.0931 | More likely | | [CVE-2025-21420](https://patchblox.com/security/data/cve/CVE-2025-21420.md) | Urgent | Windows Disk Cleanup Tool | 7.8 | 0.0367 | More likely | | [CVE-2025-21379](https://patchblox.com/security/data/cve/CVE-2025-21379.md) | Urgent | Windows DHCP Server | 7.1 | 0.0091 | | | [CVE-2025-21358](https://patchblox.com/security/data/cve/CVE-2025-21358.md) | Urgent | Windows CoreMessaging | 7.8 | 0.0076 | More likely | | [CVE-2025-21419](https://patchblox.com/security/data/cve/CVE-2025-21419.md) | Urgent | Windows Setup Files Cleanup | 7.1 | 0.0072 | More likely | | [CVE-2025-21367](https://patchblox.com/security/data/cve/CVE-2025-21367.md) | Urgent | Windows Win32 Kernel Subsystem | 7.8 | 0.0064 | More likely | | [CVE-2025-21414](https://patchblox.com/security/data/cve/CVE-2025-21414.md) | Urgent | Windows DWM Core Library | 7.0 | 0.0061 | More likely | | [CVE-2025-21184](https://patchblox.com/security/data/cve/CVE-2025-21184.md) | Urgent | Windows CoreMessaging | 7.0 | 0.0061 | More likely | | [CVE-2025-21181](https://patchblox.com/security/data/cve/CVE-2025-21181.md) | High | Windows Message Queuing | 7.5 | 0.0348 | | | [CVE-2025-21351](https://patchblox.com/security/data/cve/CVE-2025-21351.md) | High | Active Directory Domain Services | 7.5 | 0.0247 | | | [CVE-2025-21371](https://patchblox.com/security/data/cve/CVE-2025-21371.md) | High | Windows Telephony Service | 8.8 | 0.0243 | | | [CVE-2025-21368](https://patchblox.com/security/data/cve/CVE-2025-21368.md) | High | Microsoft Digest Authentication | 8.8 | 0.0215 | | | [CVE-2025-21369](https://patchblox.com/security/data/cve/CVE-2025-21369.md) | High | Microsoft Digest Authentication | 8.8 | 0.0215 | | | [CVE-2025-21406](https://patchblox.com/security/data/cve/CVE-2025-21406.md) | High | Windows Telephony Service | 8.8 | 0.0182 | | | [CVE-2025-21407](https://patchblox.com/security/data/cve/CVE-2025-21407.md) | High | Windows Telephony Service | 8.8 | 0.0182 | | | [CVE-2025-21410](https://patchblox.com/security/data/cve/CVE-2025-21410.md) | High | Windows Routing and Remote Access Service (RRAS) | 8.8 | 0.0182 | | | [CVE-2025-21190](https://patchblox.com/security/data/cve/CVE-2025-21190.md) | High | Windows Telephony Service | 8.8 | 0.0181 | | | [CVE-2025-21200](https://patchblox.com/security/data/cve/CVE-2025-21200.md) | High | Windows Telephony Service | 8.8 | 0.0181 | | | [CVE-2025-21201](https://patchblox.com/security/data/cve/CVE-2025-21201.md) | High | Windows Telephony Server | 8.8 | 0.0181 | | | [CVE-2025-21208](https://patchblox.com/security/data/cve/CVE-2025-21208.md) | High | Windows Routing and Remote Access Service (RRAS) | 8.8 | 0.0181 | | | [CVE-2025-21373](https://patchblox.com/security/data/cve/CVE-2025-21373.md) | High | Windows Installer | 7.8 | 0.0080 | | | [CVE-2025-26634](https://patchblox.com/security/data/cve/CVE-2025-26634.md) | High | Windows Core Messaging | 7.5 | 0.0067 | | | [CVE-2025-21375](https://patchblox.com/security/data/cve/CVE-2025-21375.md) | High | Microsoft Streaming Service | 7.8 | 0.0065 | | | [CVE-2025-21359](https://patchblox.com/security/data/cve/CVE-2025-21359.md) | High | Windows Kernel | 7.8 | 0.0056 | | | [CVE-2025-21182](https://patchblox.com/security/data/cve/CVE-2025-21182.md) | High | Windows Resilient File System (ReFS) Deduplication Service | 7.4 | 0.0053 | | | [CVE-2025-21183](https://patchblox.com/security/data/cve/CVE-2025-21183.md) | High | Windows Resilient File System (ReFS) Deduplication Service | 7.4 | 0.0053 | | | [CVE-2025-21350](https://patchblox.com/security/data/cve/CVE-2025-21350.md) | Routine | Windows Kerberos | 5.9 | 0.0213 | | | [CVE-2025-21349](https://patchblox.com/security/data/cve/CVE-2025-21349.md) | Routine | Windows Remote Desktop Services | 6.8 | 0.0114 | | | [CVE-2025-21254](https://patchblox.com/security/data/cve/CVE-2025-21254.md) | Routine | Windows Internet Connection Sharing (ICS) | 6.5 | 0.0104 | | | [CVE-2025-21352](https://patchblox.com/security/data/cve/CVE-2025-21352.md) | Routine | Windows Internet Connection Sharing (ICS) | 6.5 | 0.0104 | | | [CVE-2025-21212](https://patchblox.com/security/data/cve/CVE-2025-21212.md) | Routine | Windows Internet Connection Sharing (ICS) | 6.5 | 0.0103 | | | [CVE-2025-21216](https://patchblox.com/security/data/cve/CVE-2025-21216.md) | Routine | Windows Internet Connection Sharing (ICS) | 6.5 | 0.0103 | | | [CVE-2025-21179](https://patchblox.com/security/data/cve/CVE-2025-21179.md) | Routine | Windows DHCP Client | 4.8 | 0.0074 | | | [CVE-2025-21347](https://patchblox.com/security/data/cve/CVE-2025-21347.md) | Routine | Windows Update Stack | 6.0 | 0.0066 | | | [CVE-2025-21337](https://patchblox.com/security/data/cve/CVE-2025-21337.md) | Routine | Microsoft Windows | 3.3 | 0.0061 | | --- Data as of 2026-11-07T18:46:35Z UTC. 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