# KB4534309: January 2020 security update

KB4534309, released January 14, 2020, fixes 26 CVEs across 4 products. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/microsoft/kb4534309
- Platform: Microsoft
- Released: Jan 14, 2020
- Priority: Urgent (Closes CVE-2020-0609, rated Critical)
- CVEs: 26, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4534309

## 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-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-2020-0642](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-2020-0614](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-2020-0607](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-2020-0608](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 |  |

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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

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