# KB5022193: January 2023 security update

KB5022193, released January 10, 2023, fixes 5 CVEs across 2 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/kb5022193
- Platform: Microsoft
- Released: Jan 10, 2023
- Priority: Urgent (Closes CVE-2023-21745, exploitation more likely)
- CVEs: 5, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5022193

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Exchange Server 2019 Cumulative Update 11](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2019-cumulative-update-11.md) |  |  |
| [Microsoft Exchange Server 2019 Cumulative Update 12](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2019-cumulative-update-12.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-21745](https://patchblox.com/security/data/cve/CVE-2023-21745.md) | Urgent | Microsoft Exchange Server | 8.0 | 0.0154 | More likely |
| [CVE-2023-21761](https://patchblox.com/security/data/cve/CVE-2023-21761.md) | High | Microsoft Exchange Server | 7.5 | 0.0164 |  |
| [CVE-2023-21762](https://patchblox.com/security/data/cve/CVE-2023-21762.md) | High | Microsoft Exchange Server | 8.0 | 0.0159 |  |
| [CVE-2023-21763](https://patchblox.com/security/data/cve/CVE-2023-21763.md) | High | Microsoft Exchange Server | 7.8 | 0.0062 |  |
| [CVE-2023-21764](https://patchblox.com/security/data/cve/CVE-2023-21764.md) | High | Microsoft Exchange Server | 7.8 | 0.0058 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo