# KB4580387: October 2020 security update

KB4580387, released October 13, 2020, fixes 23 CVEs across 4 products. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/microsoft/kb4580387
- Platform: Microsoft
- Released: Oct 13, 2020
- Priority: Urgent (Closes CVE-2020-16923, rated Critical)
- CVEs: 23, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4580387

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Windows 7 for 32-bit Systems Service Pack 1](https://patchblox.com/security/data/product/microsoft/windows-7-for-32-bit-systems-service-pack-1.md) |  |  |
| [Windows 7 for x64-based Systems Service Pack 1](https://patchblox.com/security/data/product/microsoft/windows-7-for-x64-based-systems-service-pack-1.md) |  |  |
| [Windows Server 2008 R2 for x64-based Systems Service Pack 1](https://patchblox.com/security/data/product/microsoft/windows-server-2008-r2-for-x64-based-systems-service-pack-1.md) |  |  |
| [Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2008-r2-for-x64-based-systems-service-pack-1-server-core-installation.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-16923](https://patchblox.com/security/data/cve/CVE-2020-16923.md) | Urgent | Microsoft Graphics Component | 7.8 | 0.0383 |  |
| [CVE-2020-16891](https://patchblox.com/security/data/cve/CVE-2020-16891.md) | Urgent | Windows Hyper-V | 8.8 | 0.0095 |  |
| [CVE-2020-16922](https://patchblox.com/security/data/cve/CVE-2020-16922.md) | Urgent | Microsoft Windows | 5.3 | 0.0081 | More likely |
| [CVE-2020-16863](https://patchblox.com/security/data/cve/CVE-2020-16863.md) | High | Windows RDP | 7.5 | 0.0585 |  |
| [CVE-2020-16924](https://patchblox.com/security/data/cve/CVE-2020-16924.md) | High | Microsoft Windows | 7.8 | 0.0412 |  |
| [CVE-2020-16939](https://patchblox.com/security/data/cve/CVE-2020-16939.md) | High | Group Policy | 7.8 | 0.0242 |  |
| [CVE-2020-16940](https://patchblox.com/security/data/cve/CVE-2020-16940.md) | High | Microsoft Windows | 7.8 | 0.0155 |  |
| [CVE-2020-16920](https://patchblox.com/security/data/cve/CVE-2020-16920.md) | High | Microsoft Windows | 7.8 | 0.0142 |  |
| [CVE-2020-16935](https://patchblox.com/security/data/cve/CVE-2020-16935.md) | High | Microsoft Windows | 7.8 | 0.0100 |  |
| [CVE-2020-16916](https://patchblox.com/security/data/cve/CVE-2020-16916.md) | High | Windows COM | 7.8 | 0.0098 |  |
| [CVE-2020-16902](https://patchblox.com/security/data/cve/CVE-2020-16902.md) | High | Windows Installer | 7.8 | 0.0094 |  |
| [CVE-2020-16976](https://patchblox.com/security/data/cve/CVE-2020-16976.md) | High | Microsoft Windows | 7.8 | 0.0093 |  |
| [CVE-2020-16887](https://patchblox.com/security/data/cve/CVE-2020-16887.md) | High | Microsoft Windows | 7.8 | 0.0092 |  |
| [CVE-2020-16912](https://patchblox.com/security/data/cve/CVE-2020-16912.md) | High | Microsoft Windows | 7.8 | 0.0091 |  |
| [CVE-2020-16972](https://patchblox.com/security/data/cve/CVE-2020-16972.md) | High | Microsoft Windows | 7.8 | 0.0091 |  |
| [CVE-2020-16974](https://patchblox.com/security/data/cve/CVE-2020-16974.md) | High | Microsoft Windows | 7.8 | 0.0091 |  |
| [CVE-2020-16975](https://patchblox.com/security/data/cve/CVE-2020-16975.md) | High | Microsoft Windows | 7.8 | 0.0091 |  |
| [CVE-2020-16936](https://patchblox.com/security/data/cve/CVE-2020-16936.md) | High | Microsoft Windows | 7.8 | 0.0090 |  |
| [CVE-2020-16973](https://patchblox.com/security/data/cve/CVE-2020-16973.md) | High | Microsoft Windows | 7.8 | 0.0087 |  |
| [CVE-2020-16900](https://patchblox.com/security/data/cve/CVE-2020-16900.md) | High | Microsoft Windows | 7.0 | 0.0071 |  |
| [CVE-2020-16889](https://patchblox.com/security/data/cve/CVE-2020-16889.md) | Routine | Windows Kernel | 5.5 | 0.0136 |  |
| [CVE-2020-16914](https://patchblox.com/security/data/cve/CVE-2020-16914.md) | Routine | Microsoft Graphics Component | 5.5 | 0.0136 |  |
| [CVE-2020-16897](https://patchblox.com/security/data/cve/CVE-2020-16897.md) | Routine | Microsoft Windows | 5.5 | 0.0124 |  |

---

Data as of 2026-11-10T07:50:38Z 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.