# CVE-2022-21978: Microsoft Exchange Server Elevation of Privilege Vulnerability

CVE-2022-21978 is fixed in 5 products on 1 platform, first by KB5014260, released May 10, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-21978
- Priority: High
- CVSS: 8.2 (Important)
- EPSS: 0.0087
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: May 10, 2022
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21978

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 23 |  | [KB5014260](https://patchblox.com/security/data/fix/microsoft/kb5014260.md) | May 10, 2022 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 22 |  | [KB5014261](https://patchblox.com/security/data/fix/microsoft/kb5014261.md) | May 10, 2022 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 23 |  | [KB5014261](https://patchblox.com/security/data/fix/microsoft/kb5014261.md) | May 10, 2022 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 11 |  | [KB5014261](https://patchblox.com/security/data/fix/microsoft/kb5014261.md) | May 10, 2022 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 12 |  | [KB5014261](https://patchblox.com/security/data/fix/microsoft/kb5014261.md) | May 10, 2022 |

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Data as of 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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