# KB5021126: February 2023 security update

KB5021126, released February 14, 2023, fixes 6 CVEs in Microsoft SQL Server 2017 for x64-based Systems (CU 31). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/microsoft/kb5021126
- Platform: Microsoft
- Released: Feb 14, 2023
- Priority: High (Closes CVE-2023-21713, high severity)
- CVEs: 6, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5021126

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft SQL Server 2017 for x64-based Systems (CU 31)](https://patchblox.com/security/data/product/microsoft/microsoft-sql-server-2017-for-x64-based-systems-cu-31.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-21713](https://patchblox.com/security/data/cve/CVE-2023-21713.md) | High | SQL Server | 8.8 | 0.0177 |  |
| [CVE-2023-21705](https://patchblox.com/security/data/cve/CVE-2023-21705.md) | High | SQL Server | 8.8 | 0.0112 |  |
| [CVE-2023-23384](https://patchblox.com/security/data/cve/CVE-2023-23384.md) | High | SQL Server | 7.3 | 0.0087 |  |
| [CVE-2023-21718](https://patchblox.com/security/data/cve/CVE-2023-21718.md) | High | SQL Server | 7.8 | 0.0075 |  |
| [CVE-2023-21528](https://patchblox.com/security/data/cve/CVE-2023-21528.md) | High | SQL Server | 7.8 | 0.0040 |  |
| [CVE-2023-21704](https://patchblox.com/security/data/cve/CVE-2023-21704.md) | High | SQL Server | 7.8 | 0.0040 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo