# KB4534271: January 2020 cumulative update for Windows 10 1607 KB4534271, released January 14, 2020, fixes 34 CVEs across 13 products. 2 of them are being exploited (CVE-2020-0646); 2 on CISA KEV. Patch Radar priority: Patch now. - Web page: https://patchblox.com/security/fix/microsoft/kb4534271 - Platform: Microsoft - Released: Jan 14, 2020 - Priority: Patch now (Closes CVE-2020-0646, exploited (CISA KEV)) - CVEs: 34, exploited: 2, on CISA KEV: 2 - Vendor advisory: https://support.microsoft.com/help/4534271 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1607-for-32-bit-systems.md) | | 14393.3443 | | [Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1607-for-x64-based-systems.md) | | 14393.3443 | | [Internet Explorer 11 on Windows Server 2016](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-server-2016.md) | | 14393.3443 | | [Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-and-4.6.2-4.7-4.7.1-4.7.2-on-windows-10-version-1607-for-32-bit-systems.md) | | 14393.3443 | | [Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-and-4.6.2-4.7-4.7.1-4.7.2-on-windows-10-version-1607-for-x64-based-systems.md) | | 14393.3443 | | [Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-and-4.6.2-4.7-4.7.1-4.7.2-on-windows-server-2016.md) | | 14393.3443 | | [Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-and-4.6.2-4.7-4.7.1-4.7.2-on-windows-server-2016-server-core-installation.md) | | 14393.3443 | | [Microsoft .NET Framework 3.5 on Windows 10 Version 1607 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-10-version-1607-for-32-bit-systems.md) | | 14393.3443 | | [Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.6.2-4.7-4.7.1-4.7.2-on-windows-10-version-1607-for-32-bit-systems.md) | | 14393.3443 | | [Windows 10 Version 1607 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1607-for-32-bit-systems.md) | | 14393.3443 | | [Windows 10 Version 1607 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1607-for-x64-based-systems.md) | | 14393.3443 | | [Windows Server 2016](https://patchblox.com/security/data/product/microsoft/windows-server-2016.md) | | 14393.3443 | | [Windows Server 2016 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2016-server-core-installation.md) | | 14393.3443 | ## CVEs this fix closes | CVE | Priority | Component | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2020-0646](https://patchblox.com/security/data/cve/CVE-2020-0646.md) | Patch now | .NET Framework | n/a | 0.9922 | CISA KEV | | [CVE-2020-0601](https://patchblox.com/security/data/cve/CVE-2020-0601.md) | Patch now | Microsoft Windows | 8.1 | 0.8908 | CISA KEV | | [CVE-2020-0609](https://patchblox.com/security/data/cve/CVE-2020-0609.md) | Urgent | Windows RDP | 9.8 | 0.7768 | | | [CVE-2020-0610](https://patchblox.com/security/data/cve/CVE-2020-0610.md) | Urgent | Windows RDP | 9.8 | 0.6757 | | | [CVE-2020-0606](https://patchblox.com/security/data/cve/CVE-2020-0606.md) | Urgent | .NET Framework | n/a | 0.1834 | | | [CVE-2020-0611](https://patchblox.com/security/data/cve/CVE-2020-0611.md) | Urgent | Windows RDP | 7.5 | 0.0718 | | | [CVE-2020-0634](https://patchblox.com/security/data/cve/CVE-2020-0634.md) | Urgent | Common Log File System Driver | 7.8 | 0.0132 | More likely | | [CVE-2020-0612](https://patchblox.com/security/data/cve/CVE-2020-0612.md) | High | Windows RDP | 7.5 | 0.0488 | | | [CVE-2020-0642](https://patchblox.com/security/data/cve/CVE-2020-0642.md) | High | Microsoft Graphics Component | 7.8 | 0.0161 | | | [CVE-2020-0635](https://patchblox.com/security/data/cve/CVE-2020-0635.md) | High | Microsoft Windows | 7.8 | 0.0113 | | | [CVE-2020-0641](https://patchblox.com/security/data/cve/CVE-2020-0641.md) | High | Windows Media | 7.8 | 0.0099 | | | [CVE-2020-0644](https://patchblox.com/security/data/cve/CVE-2020-0644.md) | High | Microsoft Windows | 7.8 | 0.0093 | | | [CVE-2020-0613](https://patchblox.com/security/data/cve/CVE-2020-0613.md) | High | Microsoft Windows Search Component | 7.8 | 0.0091 | | | [CVE-2020-0633](https://patchblox.com/security/data/cve/CVE-2020-0633.md) | High | Microsoft Windows Search Component | 7.8 | 0.0087 | | | [CVE-2020-0614](https://patchblox.com/security/data/cve/CVE-2020-0614.md) | High | Microsoft Windows Search Component | 7.8 | 0.0086 | | | [CVE-2020-0623](https://patchblox.com/security/data/cve/CVE-2020-0623.md) | High | Microsoft Windows Search Component | 7.8 | 0.0086 | | | [CVE-2020-0625](https://patchblox.com/security/data/cve/CVE-2020-0625.md) | High | Microsoft Windows Search Component | 7.8 | 0.0086 | | | [CVE-2020-0627](https://patchblox.com/security/data/cve/CVE-2020-0627.md) | High | Microsoft Windows Search Component | 7.8 | 0.0086 | | | [CVE-2020-0628](https://patchblox.com/security/data/cve/CVE-2020-0628.md) | High | Microsoft Windows Search Component | 7.8 | 0.0086 | | | [CVE-2020-0631](https://patchblox.com/security/data/cve/CVE-2020-0631.md) | High | Microsoft Windows Search Component | 7.8 | 0.0081 | | | [CVE-2020-0620](https://patchblox.com/security/data/cve/CVE-2020-0620.md) | High | Microsoft Windows | 7.8 | 0.0080 | | | [CVE-2020-0626](https://patchblox.com/security/data/cve/CVE-2020-0626.md) | High | Microsoft Windows Search Component | 7.8 | 0.0080 | | | [CVE-2020-0629](https://patchblox.com/security/data/cve/CVE-2020-0629.md) | High | Microsoft Windows Search Component | 7.8 | 0.0080 | | | [CVE-2020-0630](https://patchblox.com/security/data/cve/CVE-2020-0630.md) | High | Microsoft Windows Search Component | 7.8 | 0.0080 | | | [CVE-2020-0632](https://patchblox.com/security/data/cve/CVE-2020-0632.md) | High | Microsoft Windows Search Component | 7.8 | 0.0080 | | | [CVE-2020-0640](https://patchblox.com/security/data/cve/CVE-2020-0640.md) | Routine | Microsoft Scripting Engine | 6.4 | 0.0922 | | | [CVE-2020-0607](https://patchblox.com/security/data/cve/CVE-2020-0607.md) | Routine | Microsoft Graphics Component | 5.5 | 0.0634 | | | [CVE-2020-0637](https://patchblox.com/security/data/cve/CVE-2020-0637.md) | Routine | Windows RDP | 5.7 | 0.0538 | | | [CVE-2020-0615](https://patchblox.com/security/data/cve/CVE-2020-0615.md) | Routine | Common Log File System Driver | 5.5 | 0.0180 | | | [CVE-2020-0617](https://patchblox.com/security/data/cve/CVE-2020-0617.md) | Routine | Windows Hyper-V | 5.3 | 0.0141 | | | [CVE-2020-0608](https://patchblox.com/security/data/cve/CVE-2020-0608.md) | Routine | Microsoft Windows | 5.5 | 0.0140 | | | [CVE-2020-0639](https://patchblox.com/security/data/cve/CVE-2020-0639.md) | Routine | Common Log File System Driver | 5.5 | 0.0140 | | | [CVE-2020-0643](https://patchblox.com/security/data/cve/CVE-2020-0643.md) | Routine | Microsoft Graphics Component | 5.5 | 0.0140 | | | [CVE-2020-0622](https://patchblox.com/security/data/cve/CVE-2020-0622.md) | Routine | Microsoft Graphics Component | 5.5 | 0.0139 | | --- Data as of 2026-11-07T18:46:35Z 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.