# KB5003671: June 2021 security update

KB5003671, released June 8, 2021, fixes 18 CVEs across 5 products. 5 of them are being exploited (CVE-2021-1675); 5 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/microsoft/kb5003671
- Platform: Microsoft
- Released: Jun 8, 2021
- Priority: Patch now (Closes CVE-2021-1675, exploited (CISA KEV, ransomware))
- CVEs: 18, exploited: 5, on CISA KEV: 5
- Vendor advisory: https://support.microsoft.com/help/5003671

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Windows 8.1 for 32-bit systems](https://patchblox.com/security/data/product/microsoft/windows-8.1-for-32-bit-systems.md) |  |  |
| [Windows 8.1 for x64-based systems](https://patchblox.com/security/data/product/microsoft/windows-8.1-for-x64-based-systems.md) |  |  |
| [Windows RT 8.1](https://patchblox.com/security/data/product/microsoft/windows-rt-8.1.md) |  |  |
| [Windows Server 2012 R2](https://patchblox.com/security/data/product/microsoft/windows-server-2012-r2.md) |  |  |
| [Windows Server 2012 R2 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2012-r2-server-core-installation.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-1675](https://patchblox.com/security/data/cve/CVE-2021-1675.md) | Patch now | Windows Print Spooler Components | 7.8 | 0.8531 | CISA KEV, Ransomware |
| [CVE-2021-33742](https://patchblox.com/security/data/cve/CVE-2021-33742.md) | Patch now | Windows MSHTML Platform | 7.5 | 0.5941 | CISA KEV |
| [CVE-2021-31956](https://patchblox.com/security/data/cve/CVE-2021-31956.md) | Patch now | Windows NTFS | 7.8 | 0.2227 | CISA KEV |
| [CVE-2021-31199](https://patchblox.com/security/data/cve/CVE-2021-31199.md) | Patch now | Windows Cryptographic Services | 5.2 | 0.0298 | CISA KEV |
| [CVE-2021-31201](https://patchblox.com/security/data/cve/CVE-2021-31201.md) | Patch now | Windows Cryptographic Services | 5.2 | 0.0262 | CISA KEV |
| [CVE-2021-31959](https://patchblox.com/security/data/cve/CVE-2021-31959.md) | Urgent | Microsoft Scripting Engine | 6.4 | 0.0923 | More likely |
| [CVE-2021-31954](https://patchblox.com/security/data/cve/CVE-2021-31954.md) | Urgent | Windows Common Log File System Driver | 7.8 | 0.0107 | More likely |
| [CVE-2021-31974](https://patchblox.com/security/data/cve/CVE-2021-31974.md) | High | Windows Network File System | 7.5 | 0.0673 |  |
| [CVE-2021-31962](https://patchblox.com/security/data/cve/CVE-2021-31962.md) | High | Windows Kerberos | 9.4 | 0.0381 |  |
| [CVE-2021-31975](https://patchblox.com/security/data/cve/CVE-2021-31975.md) | High | Windows Network File System | 7.5 | 0.0366 |  |
| [CVE-2021-31976](https://patchblox.com/security/data/cve/CVE-2021-31976.md) | High | Windows Network File System | 7.5 | 0.0366 |  |
| [CVE-2021-31968](https://patchblox.com/security/data/cve/CVE-2021-31968.md) | High | Windows Remote Desktop | 7.5 | 0.0318 | Disclosed |
| [CVE-2021-31958](https://patchblox.com/security/data/cve/CVE-2021-31958.md) | High | Windows NTLM | 7.5 | 0.0256 |  |
| [CVE-2021-31953](https://patchblox.com/security/data/cve/CVE-2021-31953.md) | High | Windows Filter Manager | 7.8 | 0.0055 |  |
| [CVE-2021-31973](https://patchblox.com/security/data/cve/CVE-2021-31973.md) | High | Windows Installer | 7.8 | 0.0055 |  |
| [CVE-2021-31971](https://patchblox.com/security/data/cve/CVE-2021-31971.md) | Routine | Windows HTML Platform | 6.8 | 0.0209 |  |
| [CVE-2021-31970](https://patchblox.com/security/data/cve/CVE-2021-31970.md) | Routine | Windows TCP/IP | 5.5 | 0.0086 |  |
| [CVE-2021-31972](https://patchblox.com/security/data/cve/CVE-2021-31972.md) | Routine | Windows Event Logging Service | 5.5 | 0.0076 |  |

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Data as of 2026-11-07T06:34:28Z 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