# KB4534273: January 2020 cumulative update for Windows 10 1809 KB4534273, released January 14, 2020, fixes 34 CVEs across 9 products. 2 of them are being exploited (CVE-2020-0601); 2 on CISA KEV. Patch Radar priority: Patch now. - Web page: https://patchblox.com/security/fix/microsoft/kb4534273 - Platform: Microsoft - Released: Jan 14, 2020 - Priority: Patch now (Closes CVE-2020-0601, exploited (CISA KEV)) - CVEs: 34, exploited: 2, on CISA KEV: 2 - Vendor advisory: https://support.microsoft.com/help/4534273 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1809-for-32-bit-systems.md) | | 17763.973 | | [Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1809-for-arm64-based-systems.md) | | 17763.973 | | [Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1809-for-x64-based-systems.md) | | 17763.973 | | [Internet Explorer 11 on Windows Server 2019](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-server-2019.md) | | 17763.973 | | [Windows 10 Version 1809 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1809-for-32-bit-systems.md) | | 17763.973 | | [Windows 10 Version 1809 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1809-for-arm64-based-systems.md) | | 17763.973 | | [Windows 10 Version 1809 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1809-for-x64-based-systems.md) | | 17763.973 | | [Windows Server 2019](https://patchblox.com/security/data/product/microsoft/windows-server-2019.md) | | 17763.973 | | [Windows Server 2019 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2019-server-core-installation.md) | | 17763.973 | ## CVEs this fix closes | CVE | Priority | Component | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2020-0601](https://patchblox.com/security/data/cve/CVE-2020-0601.md) | Patch now | Microsoft Windows | 8.1 | 0.8908 | CISA KEV | | [CVE-2020-0638](https://patchblox.com/security/data/cve/CVE-2020-0638.md) | Patch now | Windows Update Stack | 7.8 | 0.0254 | CISA KEV, Ransomware | | [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-2020-0611](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-2020-0616](https://patchblox.com/security/data/cve/CVE-2020-0616.md) | Routine | Microsoft Windows | 5.5 | 0.0178 | | | [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-2020-0621](https://patchblox.com/security/data/cve/CVE-2020-0621.md) | Routine | Microsoft Windows | 4.4 | 0.0104 | | --- Data as of 2026-11-09T13:31:49Z UTC. 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