# KB5063223: August 2025 security update

KB5063223, released August 12, 2025, fixes 4 CVEs in Microsoft Exchange Server 2016 Cumulative Update 23. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/microsoft/kb5063223
- Platform: Microsoft
- Released: Aug 12, 2025
- Priority: High (Closes CVE-2025-33051, high severity)
- CVEs: 4, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5063223

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Exchange Server 2016 Cumulative Update 23](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2016-cumulative-update-23.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-33051](https://patchblox.com/security/data/cve/CVE-2025-33051.md) | High | Microsoft Exchange Server | 7.5 | 0.0139 |  |
| [CVE-2025-25005](https://patchblox.com/security/data/cve/CVE-2025-25005.md) | Routine | Microsoft Exchange Server | 6.5 | 0.0145 |  |
| [CVE-2025-25006](https://patchblox.com/security/data/cve/CVE-2025-25006.md) | Routine | Microsoft Exchange Server | 5.3 | 0.0092 |  |
| [CVE-2025-25007](https://patchblox.com/security/data/cve/CVE-2025-25007.md) | Routine | Microsoft Exchange Server | 5.3 | 0.0090 |  |

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Data as of 2026-11-07T18:46:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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