# Windows Server, version 1803  (Server Core Installation) security updates

Patch Radar has 30 security fixes for Windows Server, version 1803  (Server Core Installation), closing 971 CVEs, 39 of which are being exploited. The newest security fix is KB4561621 (17134.1550), released June 9, 2020. This product is no longer supported.

- Web page: https://patchblox.com/security/product/microsoft/windows-server-version-1803-server-core-installation
- Platform: Microsoft
- Vendor: Microsoft
- Supported: no

## Security fixes, newest first

| Fix | Released | Fixed in | Priority | CVEs | Exploited |
|---|---|---|---|---:|---:|
| [KB4561621](https://patchblox.com/security/data/fix/microsoft/kb4561621.md) | Jun 9, 2020 | 17134.1550 | Patch now | 91 | 1 |
| [KB4556807](https://patchblox.com/security/data/fix/microsoft/kb4556807.md) | May 12, 2020 | 17134.1488 | Patch now | 85 | 1 |
| [KB4550922](https://patchblox.com/security/data/fix/microsoft/kb4550922.md) | Apr 14, 2020 | 17134.1425 | Patch now | 66 | 4 |
| [KB4540689](https://patchblox.com/security/data/fix/microsoft/kb4540689.md) | Mar 10, 2020 | 17134.1365 | Patch now | 85 | 1 |
| [KB4535680](https://patchblox.com/security/data/fix/microsoft/kb4535680.md) | Feb 12, 2020 |  | High | 1 | 0 |
| [KB4537762](https://patchblox.com/security/data/fix/microsoft/kb4537762.md) | Feb 11, 2020 | 17134.1304 | Patch now | 81 | 2 |
| [KB4534293](https://patchblox.com/security/data/fix/microsoft/kb4534293.md) | Jan 14, 2020 | 17134.1246 | Patch now | 32 | 3 |
| [KB4530717](https://patchblox.com/security/data/fix/microsoft/kb4530717.md) | Dec 10, 2019 | 17134.1184 | Urgent | 14 | 0 |
| [KB4525237](https://patchblox.com/security/data/fix/microsoft/kb4525237.md) | Nov 12, 2019 | 17134.1130 | Patch now | 51 | 4 |
| [KB4519765](https://patchblox.com/security/data/fix/microsoft/kb4519765.md) | Oct 9, 2019 |  | High | 1 | 0 |
| [KB4520008](https://patchblox.com/security/data/fix/microsoft/kb4520008.md) | Oct 8, 2019 | 17134.1069 | Patch now | 40 | 3 |
| [KB4516058](https://patchblox.com/security/data/fix/microsoft/kb4516058.md) | Sep 10, 2019 | 17134.1006 | Patch now | 56 | 3 |
| [KB4512501](https://patchblox.com/security/data/fix/microsoft/kb4512501.md) | Aug 13, 2019 | 17134.950 | Urgent | 70 | 0 |
| [KB4507435](https://patchblox.com/security/data/fix/microsoft/kb4507435.md) | Jul 9, 2019 | 17134.885 | Patch now | 56 | 3 |
| [KB4503286](https://patchblox.com/security/data/fix/microsoft/kb4503286.md) | Jun 11, 2019 | 17134.829 | Patch now | 64 | 2 |
| [KB4499167](https://patchblox.com/security/data/fix/microsoft/kb4499167.md) | May 14, 2019 | 17134.765 | Patch now | 56 | 2 |
| [KB4493464](https://patchblox.com/security/data/fix/microsoft/kb4493464.md) | Apr 9, 2019 | 17134.706 | Patch now | 53 | 4 |
| [KB4489868](https://patchblox.com/security/data/fix/microsoft/kb4489868.md) | Mar 12, 2019 | 17134.648 | Patch now | 54 | 2 |
| [KB4487017](https://patchblox.com/security/data/fix/microsoft/kb4487017.md) | Feb 12, 2019 | 17134.590 | Patch now | 52 | 1 |
| [KB4480966](https://patchblox.com/security/data/fix/microsoft/kb4480966.md) | Jan 8, 2019 | 17134.523 | Patch now | 33 | 2 |
| [KB4471324](https://patchblox.com/security/data/fix/microsoft/kb4471324.md) | Dec 11, 2018 | 17134.471 | Patch now | 23 | 2 |
| [KB4465663](https://patchblox.com/security/data/fix/microsoft/kb4465663.md) | Nov 13, 2018 |  | Routine | 1 | 0 |
| [KB4467702](https://patchblox.com/security/data/fix/microsoft/kb4467702.md) | Nov 13, 2018 | 17134.407 | Urgent | 30 | 0 |
| [KB4462919](https://patchblox.com/security/data/fix/microsoft/kb4462919.md) | Oct 9, 2018 | 17134.345 | Patch now | 27 | 1 |
| [KB4457128](https://patchblox.com/security/data/fix/microsoft/kb4457128.md) | Sep 11, 2018 | 17134.285 | Patch now | 47 | 1 |
| [KB4343909](https://patchblox.com/security/data/fix/microsoft/kb4343909.md) | Aug 14, 2018 | 17134.228 | Patch now | 44 | 4 |
| [KB4345421](https://patchblox.com/security/data/fix/microsoft/kb4345421.md) | Jul 16, 2018 | 17134.167 | Urgent | 33 | 0 |
| [KB4338819](https://patchblox.com/security/data/fix/microsoft/kb4338819.md) | Jul 10, 2018 | 17134.165 | Urgent | 33 | 0 |
| [KB4284835](https://patchblox.com/security/data/fix/microsoft/kb4284835.md) | Jun 12, 2018 | 17134.112 | Urgent | 36 | 0 |
| [KB4103721](https://patchblox.com/security/data/fix/microsoft/kb4103721.md) | May 8, 2018 | 17134.48 | Patch now | 39 | 2 |

---

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

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