# KB4343909: August 2018 cumulative update for Windows 10 1803 KB4343909, released August 14, 2018, fixes 44 CVEs across 13 products. 4 of them are being exploited (CVE-2018-8414); 4 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported. - Web page: https://patchblox.com/security/fix/microsoft/kb4343909 - Platform: Microsoft - Released: Aug 14, 2018 - Priority: Patch now (Closes CVE-2018-8414, exploited (CISA KEV)) - CVEs: 44, exploited: 4, on CISA KEV: 4 - Vendor advisory: https://support.microsoft.com/help/4343909 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1803-for-32-bit-systems.md) | | 17134.228 | | [Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-10-version-1803-for-x64-based-systems.md) | | 17134.228 | | [Microsoft .NET Framework 3.5 on Windows 10 Version 1803 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-10-version-1803-for-32-bit-systems.md) | | 17134.228 | | [Microsoft .NET Framework 3.5 on Windows 10 Version 1803 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-10-version-1803-for-x64-based-systems.md) | | 17134.228 | | [Microsoft .NET Framework 3.5 on Windows Server, version 1803 (Server Core Installation)](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-server-version-1803-server-core-installation.md) | | 17134.228 | | [Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.7.2-on-windows-10-version-1803-for-32-bit-systems.md) | | 17134.228 | | [Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.7.2-on-windows-10-version-1803-for-x64-based-systems.md) | | 17134.228 | | [Microsoft .NET Framework 4.7.2 on Windows Server, version 1803 (Server Core Installation)](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.7.2-on-windows-server-version-1803-server-core-installation.md) | | 17134.228 | | [Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-edge-edgehtml-based-on-windows-10-version-1803-for-32-bit-systems.md) | | 17134.228 | | [Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-edge-edgehtml-based-on-windows-10-version-1803-for-x64-based-systems.md) | | 17134.228 | | [Windows 10 Version 1803 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1803-for-32-bit-systems.md) | | 17134.228 | | [Windows 10 Version 1803 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1803-for-x64-based-systems.md) | | 17134.228 | | [Windows Server, version 1803 (Server Core Installation)](https://patchblox.com/security/data/product/microsoft/windows-server-version-1803-server-core-installation.md) | | 17134.228 | ## CVEs this fix closes | CVE | Priority | Component | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2018-8414](https://patchblox.com/security/data/cve/CVE-2018-8414.md) | Patch now | Windows Shell | 4.8 | 0.7262 | CISA KEV, Disclosed | | [CVE-2018-8373](https://patchblox.com/security/data/cve/CVE-2018-8373.md) | Patch now | Microsoft Scripting Engine | 6.4 | 0.6177 | CISA KEV, Disclosed | | [CVE-2018-8405](https://patchblox.com/security/data/cve/CVE-2018-8405.md) | Patch now | Microsoft Graphics Component | 7.0 | 0.0344 | CISA KEV, Ransomware | | [CVE-2018-8406](https://patchblox.com/security/data/cve/CVE-2018-8406.md) | Patch now | Microsoft Graphics Component | 7.0 | 0.0344 | CISA KEV, Ransomware | | [CVE-2018-8355](https://patchblox.com/security/data/cve/CVE-2018-8355.md) | Urgent | Microsoft Scripting Engine | 4.2 | 0.6790 | More likely | | [CVE-2018-8353](https://patchblox.com/security/data/cve/CVE-2018-8353.md) | Urgent | Microsoft Scripting Engine | 6.4 | 0.6734 | More likely | | [CVE-2018-8389](https://patchblox.com/security/data/cve/CVE-2018-8389.md) | Urgent | Microsoft Scripting Engine | 6.4 | 0.3035 | More likely | | [CVE-2018-8266](https://patchblox.com/security/data/cve/CVE-2018-8266.md) | Urgent | Microsoft Scripting Engine | 4.2 | 0.2868 | More likely | | [CVE-2018-8372](https://patchblox.com/security/data/cve/CVE-2018-8372.md) | Urgent | Microsoft Scripting Engine | 4.2 | 0.2628 | More likely | | [CVE-2018-8344](https://patchblox.com/security/data/cve/CVE-2018-8344.md) | Urgent | Microsoft Graphics Component | 7.8 | 0.2298 | More likely | | [CVE-2018-8350](https://patchblox.com/security/data/cve/CVE-2018-8350.md) | Urgent | Microsoft Windows PDF | 4.2 | 0.1977 | | | [CVE-2018-8371](https://patchblox.com/security/data/cve/CVE-2018-8371.md) | Urgent | Microsoft Scripting Engine | 6.4 | 0.1538 | More likely | | [CVE-2018-8380](https://patchblox.com/security/data/cve/CVE-2018-8380.md) | Urgent | Microsoft Scripting Engine | 4.2 | 0.1538 | More likely | | [CVE-2018-8381](https://patchblox.com/security/data/cve/CVE-2018-8381.md) | Urgent | Microsoft Scripting Engine | 4.2 | 0.1538 | More likely | | [CVE-2018-8390](https://patchblox.com/security/data/cve/CVE-2018-8390.md) | Urgent | Microsoft Scripting Engine | 4.2 | 0.1538 | | | [CVE-2018-8385](https://patchblox.com/security/data/cve/CVE-2018-8385.md) | Urgent | Microsoft Scripting Engine | 7.5 | 0.1517 | More likely | | [CVE-2018-8345](https://patchblox.com/security/data/cve/CVE-2018-8345.md) | Urgent | Microsoft Windows | 7.5 | 0.1490 | More likely | | [CVE-2018-8403](https://patchblox.com/security/data/cve/CVE-2018-8403.md) | Urgent | Microsoft Browsers | 4.2 | 0.1337 | More likely | | [CVE-2018-8377](https://patchblox.com/security/data/cve/CVE-2018-8377.md) | Urgent | Microsoft Edge | 4.2 | 0.1018 | | | [CVE-2018-8387](https://patchblox.com/security/data/cve/CVE-2018-8387.md) | Urgent | Microsoft Edge | 4.2 | 0.1018 | More likely | | [CVE-2018-8383](https://patchblox.com/security/data/cve/CVE-2018-8383.md) | Urgent | Microsoft Edge | 4.3 | 0.0761 | More likely | | [CVE-2018-8401](https://patchblox.com/security/data/cve/CVE-2018-8401.md) | Urgent | Microsoft Graphics Component | 7.0 | 0.0209 | More likely | | [CVE-2018-8347](https://patchblox.com/security/data/cve/CVE-2018-8347.md) | Urgent | Windows Kernel | 7.0 | 0.0135 | More likely | | [CVE-2018-8404](https://patchblox.com/security/data/cve/CVE-2018-8404.md) | Urgent | Windows Kernel | 7.0 | 0.0122 | More likely | | [CVE-2018-8349](https://patchblox.com/security/data/cve/CVE-2018-8349.md) | High | Windows COM | 7.0 | 0.2340 | | | [CVE-2018-8360](https://patchblox.com/security/data/cve/CVE-2018-8360.md) | High | .NET Framework | n/a | 0.0957 | | | [CVE-2018-8400](https://patchblox.com/security/data/cve/CVE-2018-8400.md) | High | Microsoft Graphics Component | 7.0 | 0.0209 | | | [CVE-2018-8202](https://patchblox.com/security/data/cve/CVE-2018-8202.md) | High | .NET Framework | n/a | 0.0131 | | | [CVE-2018-8343](https://patchblox.com/security/data/cve/CVE-2018-8343.md) | High | Windows NDIS | 7.0 | 0.0129 | | | [CVE-2018-8339](https://patchblox.com/security/data/cve/CVE-2018-8339.md) | High | Windows Installer | 7.4 | 0.0116 | | | [CVE-2018-8399](https://patchblox.com/security/data/cve/CVE-2018-8399.md) | High | Windows Kernel | 7.0 | 0.0116 | | | [CVE-2018-8316](https://patchblox.com/security/data/cve/CVE-2018-8316.md) | Routine | Internet Explorer | 6.4 | 0.1450 | | | [CVE-2018-8394](https://patchblox.com/security/data/cve/CVE-2018-8394.md) | Routine | Microsoft Graphics Component | 4.7 | 0.0851 | | | [CVE-2018-8398](https://patchblox.com/security/data/cve/CVE-2018-8398.md) | Routine | Microsoft Graphics Component | 4.7 | 0.0851 | | | [CVE-2018-8351](https://patchblox.com/security/data/cve/CVE-2018-8351.md) | Routine | Microsoft Browsers | 4.2 | 0.0839 | | | [CVE-2018-8357](https://patchblox.com/security/data/cve/CVE-2018-8357.md) | Routine | Microsoft Browsers | 3.0 | 0.0829 | | | [CVE-2018-8340](https://patchblox.com/security/data/cve/CVE-2018-8340.md) | Routine | Windows Authentication Methods | 6.5 | 0.0789 | | | [CVE-2018-0952](https://patchblox.com/security/data/cve/CVE-2018-0952.md) | Routine | Windows Diagnostic Hub | 6.7 | 0.0623 | | | [CVE-2018-8370](https://patchblox.com/security/data/cve/CVE-2018-8370.md) | Routine | Microsoft Edge | 3.1 | 0.0488 | | | [CVE-2018-8388](https://patchblox.com/security/data/cve/CVE-2018-8388.md) | Routine | Microsoft Edge | 5.4 | 0.0391 | | | [CVE-2018-8341](https://patchblox.com/security/data/cve/CVE-2018-8341.md) | Routine | Windows Kernel | 4.7 | 0.0285 | | | [CVE-2018-8348](https://patchblox.com/security/data/cve/CVE-2018-8348.md) | Routine | Windows Kernel | 4.7 | 0.0235 | | | [CVE-2018-8200](https://patchblox.com/security/data/cve/CVE-2018-8200.md) | Routine | Device Guard | 5.3 | 0.0153 | | | [CVE-2018-8204](https://patchblox.com/security/data/cve/CVE-2018-8204.md) | Routine | Device Guard | 5.3 | 0.0153 | | --- Data as of 2026-11-08T19:12:23Z 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.