# KB4343888: August 2018 security update

KB4343888, released August 14, 2018, fixes 12 CVEs across 4 products. One of them is being exploited (CVE-2018-8405); 1 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/microsoft/kb4343888
- Platform: Microsoft
- Released: Aug 14, 2018
- Priority: Patch now (Closes CVE-2018-8405, exploited (CISA KEV, ransomware))
- CVEs: 12, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://support.microsoft.com/help/4343888

## 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 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-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-2018-8344](https://patchblox.com/security/data/cve/CVE-2018-8344.md) | Urgent | Microsoft Graphics Component | 7.8 | 0.2298 | 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-2018-8404](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-2018-8343](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-2018-8394](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-2018-8340](https://patchblox.com/security/data/cve/CVE-2018-8340.md) | Routine | Windows Authentication Methods | 6.5 | 0.0789 |  |
| [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 |  |

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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