# KB4011637: January 2018 security update

KB4011637, released January 9, 2018, fixes 1 CVE across 3 products. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/microsoft/kb4011637
- Platform: Microsoft
- Released: Jan 9, 2018
- Priority: High (Closes CVE-2018-0791, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4011637

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Outlook 2013 RT Service Pack 1](https://patchblox.com/security/data/product/microsoft/microsoft-outlook-2013-rt-service-pack-1.md) |  |  |
| [Microsoft Outlook 2013 Service Pack 1 (32-bit editions)](https://patchblox.com/security/data/product/microsoft/microsoft-outlook-2013-service-pack-1-32-bit-editions.md) |  |  |
| [Microsoft Outlook 2013 Service Pack 1 (64-bit editions)](https://patchblox.com/security/data/product/microsoft/microsoft-outlook-2013-service-pack-1-64-bit-editions.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2018-0791](https://patchblox.com/security/data/cve/CVE-2018-0791.md) | High | Microsoft Office | n/a | 0.2057 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo