# KB4556799: May 2020 cumulative update for Windows 10 1903 KB4556799, released May 12, 2020, fixes 92 CVEs across 20 products. 2 of them are being exploited (CVE-2020-1054); 2 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported. - Web page: https://patchblox.com/security/fix/microsoft/kb4556799 - Platform: Microsoft - Released: May 12, 2020 - Priority: Patch now (Closes CVE-2020-1054, exploited (CISA KEV)) - CVEs: 92, exploited: 2, on CISA KEV: 2 - Vendor advisory: https://support.microsoft.com/help/4556799 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1903-for-32-bit-systems.md) | | | | [Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1903-for-arm64-based-systems.md) | | | | [Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1903-for-x64-based-systems.md) | | | | [Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1909-for-32-bit-systems.md) | | | | [Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1909-for-arm64-based-systems.md) | | | | [Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1909-for-x64-based-systems.md) | | | | [Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-edge-edgehtml-based-on-windows-10-version-1903-for-32-bit-systems.md) | | | | [Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-edge-edgehtml-based-on-windows-10-version-1903-for-arm64-based-systems.md) | | | | [Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-edge-edgehtml-based-on-windows-10-version-1903-for-x64-based-systems.md) | | | | [Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-edge-edgehtml-based-on-windows-10-version-1909-for-32-bit-systems.md) | | | | [Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-edge-edgehtml-based-on-windows-10-version-1909-for-arm64-based-systems.md) | | | | [Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-edge-edgehtml-based-on-windows-10-version-1909-for-x64-based-systems.md) | | | | [Windows 10 Version 1903 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1903-for-32-bit-systems.md) | | | | [Windows 10 Version 1903 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1903-for-arm64-based-systems.md) | | | | [Windows 10 Version 1903 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1903-for-x64-based-systems.md) | | | | [Windows 10 Version 1909 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1909-for-32-bit-systems.md) | | | | [Windows 10 Version 1909 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1909-for-arm64-based-systems.md) | | | | [Windows 10 Version 1909 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1909-for-x64-based-systems.md) | | | | [Windows Server, version 1903 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-version-1903-server-core-installation.md) | | | | [Windows Server, version 1909 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-version-1909-server-core-installation.md) | | | ## CVEs this fix closes | CVE | Priority | Component | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2020-1054](https://patchblox.com/security/data/cve/CVE-2020-1054.md) | Patch now | Microsoft Graphics Component | 7.0 | 0.5388 | CISA KEV | | [CVE-2020-0986](https://patchblox.com/security/data/cve/CVE-2020-0986.md) | Patch now | Microsoft Graphics Component | n/a | 0.1641 | CISA KEV | | [CVE-2020-1062](https://patchblox.com/security/data/cve/CVE-2020-1062.md) | Urgent | Internet Explorer | 6.4 | 0.0624 | More likely | | [CVE-2020-1126](https://patchblox.com/security/data/cve/CVE-2020-1126.md) | Urgent | Microsoft Windows | 8.8 | 0.0414 | | | [CVE-2020-1117](https://patchblox.com/security/data/cve/CVE-2020-1117.md) | Urgent | Microsoft Graphics Component | 8.8 | 0.0409 | | | [CVE-2020-1153](https://patchblox.com/security/data/cve/CVE-2020-1153.md) | Urgent | Microsoft Graphics Component | 7.8 | 0.0396 | | | [CVE-2020-1028](https://patchblox.com/security/data/cve/CVE-2020-1028.md) | Urgent | Microsoft Windows | 7.8 | 0.0391 | | | [CVE-2020-1136](https://patchblox.com/security/data/cve/CVE-2020-1136.md) | Urgent | Microsoft Windows | 7.8 | 0.0391 | | | [CVE-2020-1035](https://patchblox.com/security/data/cve/CVE-2020-1035.md) | Urgent | Microsoft Scripting Engine | 6.4 | 0.0325 | More likely | | [CVE-2020-1058](https://patchblox.com/security/data/cve/CVE-2020-1058.md) | Urgent | Microsoft Scripting Engine | 6.4 | 0.0318 | More likely | | [CVE-2020-1060](https://patchblox.com/security/data/cve/CVE-2020-1060.md) | Urgent | Microsoft Scripting Engine | 6.4 | 0.0318 | More likely | | [CVE-2020-1037](https://patchblox.com/security/data/cve/CVE-2020-1037.md) | Urgent | Microsoft Scripting Engine | 4.2 | 0.0224 | | | [CVE-2020-1065](https://patchblox.com/security/data/cve/CVE-2020-1065.md) | Urgent | Microsoft Scripting Engine | 4.2 | 0.0224 | | | [CVE-2020-1056](https://patchblox.com/security/data/cve/CVE-2020-1056.md) | Urgent | Microsoft Edge (HTML-based) | 5.4 | 0.0214 | | | [CVE-2020-1143](https://patchblox.com/security/data/cve/CVE-2020-1143.md) | Urgent | Microsoft Windows | 7.0 | 0.0108 | More likely | | [CVE-2020-1135](https://patchblox.com/security/data/cve/CVE-2020-1135.md) | Urgent | Microsoft Graphics Component | 7.8 | 0.0098 | More likely | | [CVE-2018-0886](https://patchblox.com/security/data/cve/CVE-2018-0886.md) | High | Microsoft Windows | 7.1 | 0.8197 | | | [CVE-2020-1048](https://patchblox.com/security/data/cve/CVE-2020-1048.md) | High | Microsoft Windows | 7.8 | 0.1650 | | | [CVE-2020-1118](https://patchblox.com/security/data/cve/CVE-2020-1118.md) | High | Microsoft Windows | 8.6 | 0.1515 | | | [CVE-2020-1179](https://patchblox.com/security/data/cve/CVE-2020-1179.md) | High | Microsoft Graphics Component | n/a | 0.0522 | | | [CVE-2020-0909](https://patchblox.com/security/data/cve/CVE-2020-0909.md) | High | Windows Hyper-V | 7.5 | 0.0473 | | | [CVE-2020-1174](https://patchblox.com/security/data/cve/CVE-2020-1174.md) | High | Microsoft JET Database Engine | 7.8 | 0.0380 | | | [CVE-2020-1051](https://patchblox.com/security/data/cve/CVE-2020-1051.md) | High | Microsoft JET Database Engine | 7.8 | 0.0377 | | | [CVE-2020-1175](https://patchblox.com/security/data/cve/CVE-2020-1175.md) | High | Microsoft JET Database Engine | 7.8 | 0.0377 | | | [CVE-2020-1176](https://patchblox.com/security/data/cve/CVE-2020-1176.md) | High | Microsoft JET Database Engine | 7.8 | 0.0377 | | | [CVE-2020-1061](https://patchblox.com/security/data/cve/CVE-2020-1061.md) | High | Windows Scripting | 7.5 | 0.0335 | | | [CVE-2020-1112](https://patchblox.com/security/data/cve/CVE-2020-1112.md) | High | Microsoft Windows | 8.5 | 0.0329 | | | [CVE-2020-1139](https://patchblox.com/security/data/cve/CVE-2020-1139.md) | High | Microsoft Windows | 7.8 | 0.0258 | | | [CVE-2020-1155](https://patchblox.com/security/data/cve/CVE-2020-1155.md) | High | Microsoft Windows | 7.8 | 0.0258 | | | [CVE-2020-1156](https://patchblox.com/security/data/cve/CVE-2020-1156.md) | High | Microsoft Windows | 7.8 | 0.0258 | | | [CVE-2020-1157](https://patchblox.com/security/data/cve/CVE-2020-1157.md) | High | Microsoft Windows | 7.8 | 0.0258 | | | [CVE-2020-1158](https://patchblox.com/security/data/cve/CVE-2020-1158.md) | High | Microsoft Windows | 7.8 | 0.0256 | | | [CVE-2020-1067](https://patchblox.com/security/data/cve/CVE-2020-1067.md) | High | Microsoft Windows | 7.8 | 0.0254 | | | [CVE-2020-1055](https://patchblox.com/security/data/cve/CVE-2020-1055.md) | High | Active Directory | n/a | 0.0245 | | | [CVE-2020-1125](https://patchblox.com/security/data/cve/CVE-2020-1125.md) | High | Microsoft Windows | 7.0 | 0.0227 | | | [CVE-2020-1149](https://patchblox.com/security/data/cve/CVE-2020-1149.md) | High | Microsoft Windows | 7.0 | 0.0227 | | | [CVE-2020-1151](https://patchblox.com/security/data/cve/CVE-2020-1151.md) | High | Microsoft Windows | 7.0 | 0.0227 | | | [CVE-2020-1164](https://patchblox.com/security/data/cve/CVE-2020-1164.md) | High | Microsoft Windows | 7.0 | 0.0225 | | | [CVE-2020-1191](https://patchblox.com/security/data/cve/CVE-2020-1191.md) | High | Microsoft Windows | 7.8 | 0.0169 | | | [CVE-2020-1070](https://patchblox.com/security/data/cve/CVE-2020-1070.md) | High | Microsoft Windows | 7.8 | 0.0115 | | | [CVE-2020-1079](https://patchblox.com/security/data/cve/CVE-2020-1079.md) | High | Microsoft Windows | 7.8 | 0.0099 | | | [CVE-2020-1109](https://patchblox.com/security/data/cve/CVE-2020-1109.md) | High | Windows Update Stack | 7.8 | 0.0099 | | | [CVE-2020-1082](https://patchblox.com/security/data/cve/CVE-2020-1082.md) | High | Microsoft Windows | 7.8 | 0.0099 | | | [CVE-2020-1010](https://patchblox.com/security/data/cve/CVE-2020-1010.md) | High | Microsoft Windows | 7.8 | 0.0098 | | | [CVE-2020-1068](https://patchblox.com/security/data/cve/CVE-2020-1068.md) | High | Microsoft Windows | 7.8 | 0.0095 | | | [CVE-2020-1081](https://patchblox.com/security/data/cve/CVE-2020-1081.md) | High | Microsoft Windows | 7.8 | 0.0095 | | | [CVE-2020-1110](https://patchblox.com/security/data/cve/CVE-2020-1110.md) | High | Windows Update Stack | 7.8 | 0.0095 | | | [CVE-2020-1111](https://patchblox.com/security/data/cve/CVE-2020-1111.md) | High | Microsoft Windows | 7.8 | 0.0095 | | | [CVE-2020-1114](https://patchblox.com/security/data/cve/CVE-2020-1114.md) | High | Windows Kernel | 7.8 | 0.0095 | | | [CVE-2020-1137](https://patchblox.com/security/data/cve/CVE-2020-1137.md) | High | Microsoft Windows | 7.8 | 0.0095 | | | [CVE-2020-1140](https://patchblox.com/security/data/cve/CVE-2020-1140.md) | High | Microsoft Graphics Component | 7.8 | 0.0095 | | | [CVE-2020-1142](https://patchblox.com/security/data/cve/CVE-2020-1142.md) | High | Microsoft Graphics Component | 7.8 | 0.0095 | | | [CVE-2020-1154](https://patchblox.com/security/data/cve/CVE-2020-1154.md) | High | Common Log File System Driver | 7.8 | 0.0095 | | | [CVE-2020-1165](https://patchblox.com/security/data/cve/CVE-2020-1165.md) | High | Microsoft Windows | 7.8 | 0.0095 | | | [CVE-2020-1166](https://patchblox.com/security/data/cve/CVE-2020-1166.md) | High | Microsoft Windows | 7.8 | 0.0095 | | | [CVE-2020-1021](https://patchblox.com/security/data/cve/CVE-2020-1021.md) | High | Microsoft Windows | 7.8 | 0.0095 | | | [CVE-2020-1088](https://patchblox.com/security/data/cve/CVE-2020-1088.md) | High | Microsoft Windows | 7.8 | 0.0088 | | | [CVE-2020-1077](https://patchblox.com/security/data/cve/CVE-2020-1077.md) | High | Microsoft Windows | 7.8 | 0.0087 | | | [CVE-2020-1121](https://patchblox.com/security/data/cve/CVE-2020-1121.md) | High | Microsoft Windows | 7.0 | 0.0086 | | | [CVE-2020-1132](https://patchblox.com/security/data/cve/CVE-2020-1132.md) | High | Microsoft Windows | 7.0 | 0.0086 | | | [CVE-2020-1138](https://patchblox.com/security/data/cve/CVE-2020-1138.md) | High | Microsoft Windows | 7.0 | 0.0086 | | | [CVE-2020-1078](https://patchblox.com/security/data/cve/CVE-2020-1078.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1086](https://patchblox.com/security/data/cve/CVE-2020-1086.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1087](https://patchblox.com/security/data/cve/CVE-2020-1087.md) | High | Windows Kernel | 7.8 | 0.0084 | | | [CVE-2020-1090](https://patchblox.com/security/data/cve/CVE-2020-1090.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1124](https://patchblox.com/security/data/cve/CVE-2020-1124.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1134](https://patchblox.com/security/data/cve/CVE-2020-1134.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1144](https://patchblox.com/security/data/cve/CVE-2020-1144.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1184](https://patchblox.com/security/data/cve/CVE-2020-1184.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1185](https://patchblox.com/security/data/cve/CVE-2020-1185.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1186](https://patchblox.com/security/data/cve/CVE-2020-1186.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1187](https://patchblox.com/security/data/cve/CVE-2020-1187.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1188](https://patchblox.com/security/data/cve/CVE-2020-1188.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1189](https://patchblox.com/security/data/cve/CVE-2020-1189.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1190](https://patchblox.com/security/data/cve/CVE-2020-1190.md) | High | Microsoft Windows | 7.8 | 0.0084 | | | [CVE-2020-1113](https://patchblox.com/security/data/cve/CVE-2020-1113.md) | Routine | Windows Task Scheduler | 5.3 | 0.0631 | | | [CVE-2020-0963](https://patchblox.com/security/data/cve/CVE-2020-0963.md) | Routine | Microsoft Graphics Component | 5.5 | 0.0476 | | | [CVE-2020-1064](https://patchblox.com/security/data/cve/CVE-2020-1064.md) | Routine | Internet Explorer | 6.4 | 0.0325 | | | [CVE-2020-1093](https://patchblox.com/security/data/cve/CVE-2020-1093.md) | Routine | Internet Explorer | 6.4 | 0.0325 | | | [CVE-2020-1092](https://patchblox.com/security/data/cve/CVE-2020-1092.md) | Routine | Internet Explorer | 6.4 | 0.0320 | | | [CVE-2020-1059](https://patchblox.com/security/data/cve/CVE-2020-1059.md) | Routine | Microsoft Edge (HTML-based) | 4.3 | 0.0211 | | | [CVE-2020-1096](https://patchblox.com/security/data/cve/CVE-2020-1096.md) | Routine | Microsoft Edge (HTML-based) | 4.2 | 0.0207 | | | [CVE-2020-1141](https://patchblox.com/security/data/cve/CVE-2020-1141.md) | Routine | Microsoft Graphics Component | 5.5 | 0.0202 | | | [CVE-2020-1145](https://patchblox.com/security/data/cve/CVE-2020-1145.md) | Routine | Microsoft Graphics Component | 5.5 | 0.0202 | | | [CVE-2020-1075](https://patchblox.com/security/data/cve/CVE-2020-1075.md) | Routine | Windows Subsystem for Linux | 5.5 | 0.0134 | | | [CVE-2020-1072](https://patchblox.com/security/data/cve/CVE-2020-1072.md) | Routine | Microsoft Windows | 5.5 | 0.0128 | | | [CVE-2020-1116](https://patchblox.com/security/data/cve/CVE-2020-1116.md) | Routine | Microsoft Windows | 5.5 | 0.0128 | | | [CVE-2020-1076](https://patchblox.com/security/data/cve/CVE-2020-1076.md) | Routine | Microsoft Windows | 5.5 | 0.0110 | | | [CVE-2020-1084](https://patchblox.com/security/data/cve/CVE-2020-1084.md) | Routine | Microsoft Windows | 5.5 | 0.0110 | | | [CVE-2020-1123](https://patchblox.com/security/data/cve/CVE-2020-1123.md) | Routine | Microsoft Windows | 5.5 | 0.0110 | | | [CVE-2020-1131](https://patchblox.com/security/data/cve/CVE-2020-1131.md) | Routine | Microsoft Windows | 5.5 | 0.0109 | | | [CVE-2020-1071](https://patchblox.com/security/data/cve/CVE-2020-1071.md) | Routine | Microsoft Windows | 6.8 | 0.0104 | | --- Data as of 2026-11-07T12:40:37Z 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 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.