# KB4583459: January 2021 security update

KB4583459, released January 12, 2021, fixes 1 CVE in Microsoft SQL Server 2019 for x64-based Systems (CU 8). None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/microsoft/kb4583459
- Platform: Microsoft
- Released: Jan 12, 2021
- Priority: High (Closes CVE-2021-1636, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4583459

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft SQL Server 2019 for x64-based Systems (CU 8)](https://patchblox.com/security/data/product/microsoft/microsoft-sql-server-2019-for-x64-based-systems-cu-8.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-1636](https://patchblox.com/security/data/cve/CVE-2021-1636.md) | High | SQL Server | 8.8 | 0.0669 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo