# CVE-2019-1204: Microsoft Outlook Elevation of Privilege Vulnerability

CVE-2019-1204 is fixed in 7 products on 1 platform, first by KB4475573, released August 13, 2019. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2019-1204
- Priority: Urgent
- CVSS: n/a (Important)
- EPSS: 0.0442
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Aug 13, 2019
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1204

## Description

<p>An elevation of privilege vulnerability exists when Microsoft Outlook initiates processing of incoming messages without sufficient validation of the formatting of the messages. An attacker who successfully exploited the vulnerability could attempt to force Outlook to load a local or remote message store (over SMB).</p> <p>To exploit the vulnerability, the attacker could send a specially crafted email to a victim. Outlook would then attempt to open a pre-configured message store contained in the email upon receipt of the email.</p> <p>This update addresses the vulnerability by ensuring Office fully validates incoming email formatting before processing message content.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Outlook 2010 Service Pack 2 (32-bit editions) |  | [KB4475573](https://patchblox.com/security/data/fix/microsoft/kb4475573.md) | Aug 13, 2019 |
| Microsoft | Microsoft Outlook 2010 Service Pack 2 (64-bit editions) |  | [KB4475573](https://patchblox.com/security/data/fix/microsoft/kb4475573.md) | Aug 13, 2019 |
| Microsoft | Microsoft Outlook 2013 RT Service Pack 1 |  | [KB4475563](https://patchblox.com/security/data/fix/microsoft/kb4475563.md) | Aug 13, 2019 |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 (32-bit editions) |  | [KB4475563](https://patchblox.com/security/data/fix/microsoft/kb4475563.md) | Aug 13, 2019 |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 (64-bit editions) |  | [KB4475563](https://patchblox.com/security/data/fix/microsoft/kb4475563.md) | Aug 13, 2019 |
| Microsoft | Microsoft Outlook 2016 (32-bit edition) |  | [KB4475553](https://patchblox.com/security/data/fix/microsoft/kb4475553.md) | Aug 13, 2019 |
| Microsoft | Microsoft Outlook 2016 (64-bit edition) |  | [KB4475553](https://patchblox.com/security/data/fix/microsoft/kb4475553.md) | Aug 13, 2019 |

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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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