# Microsoft Exchange Server 2013 Cumulative Update 23 security updates

Patch Radar has 20 security fixes for Microsoft Exchange Server 2013 Cumulative Update 23, closing 57 CVEs, 14 of which are being exploited. The newest security fix is KB5023038, released February 14, 2023. This product is no longer supported.

- Web page: https://patchblox.com/security/product/microsoft/microsoft-exchange-server-2013-cumulative-update-23
- Platform: Microsoft
- Vendor: Microsoft
- Supported: no

## Security fixes, newest first

| Fix | Released | Fixed in | Priority | CVEs | Exploited |
|---|---|---|---|---:|---:|
| [KB5023038](https://patchblox.com/security/data/fix/microsoft/kb5023038.md) | Feb 14, 2023 |  | Patch now | 3 | 1 |
| [KB5024296](https://patchblox.com/security/data/fix/microsoft/kb5024296.md) | Feb 14, 2023 |  | Urgent | 1 | 0 |
| [KB5022188](https://patchblox.com/security/data/fix/microsoft/kb5022188.md) | Jan 10, 2023 |  | High | 1 | 0 |
| [KB5019758](https://patchblox.com/security/data/fix/microsoft/kb5019758.md) | Nov 8, 2022 |  | Patch now | 6 | 3 |
| [KB5019076](https://patchblox.com/security/data/fix/microsoft/kb5019076.md) | Aug 9, 2022 |  | Urgent | 5 | 0 |
| [KB5014260](https://patchblox.com/security/data/fix/microsoft/kb5014260.md) | May 10, 2022 |  | High | 1 | 0 |
| [KB5010324](https://patchblox.com/security/data/fix/microsoft/kb5010324.md) | Mar 8, 2022 |  | Urgent | 1 | 0 |
| [KB5008631](https://patchblox.com/security/data/fix/microsoft/kb5008631.md) | Jan 11, 2022 |  | Urgent | 3 | 0 |
| [KB5007409](https://patchblox.com/security/data/fix/microsoft/kb5007409.md) | Nov 9, 2021 |  | Patch now | 3 | 1 |
| [KB5007011](https://patchblox.com/security/data/fix/microsoft/kb5007011.md) | Oct 12, 2021 |  | High | 1 | 0 |
| [KB5004778](https://patchblox.com/security/data/fix/microsoft/kb5004778.md) | Jul 13, 2021 |  | Patch now | 3 | 1 |
| [KB5003435](https://patchblox.com/security/data/fix/microsoft/kb5003435.md) | May 11, 2021 |  | Patch now | 4 | 1 |
| [KB5001779](https://patchblox.com/security/data/fix/microsoft/kb5001779.md) | Apr 13, 2021 |  | Patch now | 7 | 3 |
| [KB5000871](https://patchblox.com/security/data/fix/microsoft/kb5000871.md) | Mar 10, 2021 |  | Patch now | 7 | 4 |
| [KB4593466](https://patchblox.com/security/data/fix/microsoft/kb4593466.md) | Dec 8, 2020 |  | Urgent | 4 | 0 |
| [KB4588741](https://patchblox.com/security/data/fix/microsoft/kb4588741.md) | Nov 10, 2020 |  | High | 3 | 0 |
| [KB4581424](https://patchblox.com/security/data/fix/microsoft/kb4581424.md) | Oct 13, 2020 |  | High | 1 | 0 |
| [KB4536988](https://patchblox.com/security/data/fix/microsoft/kb4536988.md) | Feb 11, 2020 |  | Patch now | 2 | 1 |
| [KB4523171](https://patchblox.com/security/data/fix/microsoft/kb4523171.md) | Nov 12, 2019 |  | Urgent | 1 | 0 |
| [KB4509409](https://patchblox.com/security/data/fix/microsoft/kb4509409.md) | Jul 9, 2019 |  | High | 3 | 0 |

---

Data as of 2026-11-12T07:53:35Z 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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