# KB5002543: February 2024 security update

KB5002543, released February 13, 2024, fixes 1 CVE across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/microsoft/kb5002543
- Platform: Microsoft
- Released: Feb 13, 2024
- Priority: Urgent (Closes CVE-2024-21378, exploitation more likely)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5002543

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Outlook 2016 (32-bit edition)](https://patchblox.com/security/data/product/microsoft/microsoft-outlook-2016-32-bit-edition.md) |  |  |
| [Microsoft Outlook 2016 (64-bit edition)](https://patchblox.com/security/data/product/microsoft/microsoft-outlook-2016-64-bit-edition.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2024-21378](https://patchblox.com/security/data/cve/CVE-2024-21378.md) | Urgent | Microsoft Office Outlook | 8.8 | 0.1098 | More likely |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo