# CVE-2017-8508: Microsoft Outlook Security Feature Bypass Vulnerability

CVE-2017-8508 is fixed in 8 products on 1 platform, first by KB3191898, released June 13, 2017. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2017-8508
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.0419
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jun 13, 2017
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-8508

## Description

<p>A security feature bypass vulnerability exists in Microsoft Outlook software when it improperly handles the parsing of file formats. The security feature bypass by itself does not allow arbitrary code execution. However, to successfully exploit the vulnerability, an attacker would have to use it in conjunction with another vulnerability, such as a remote code execution vulnerability, to take advantage of the security feature bypass vulnerability and run arbitrary code.</p> <p>To exploit the vulnerability, an attacker would have to convince a user to open a specially crafted file with an affected version of Microsoft Outlook software.</p> <p>The security update addresses the vulnerability by correcting how Microsoft Outlook handles the parsing of file formats.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Outlook 2007 Service Pack 3 |  | [KB3191898](https://patchblox.com/security/data/fix/microsoft/kb3191898.md) | Jun 13, 2017 |
| Microsoft | Microsoft Outlook 2010 Service Pack 2 (32-bit editions) |  | [KB3203467](https://patchblox.com/security/data/fix/microsoft/kb3203467.md) | Jun 13, 2017 |
| Microsoft | Microsoft Outlook 2010 Service Pack 2 (64-bit editions) |  | [KB3203467](https://patchblox.com/security/data/fix/microsoft/kb3203467.md) | Jun 13, 2017 |
| Microsoft | Microsoft Outlook 2013 RT Service Pack 1 |  | [KB3191938](https://patchblox.com/security/data/fix/microsoft/kb3191938.md) | Jun 13, 2017 |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 (32-bit editions) |  | [KB3191938](https://patchblox.com/security/data/fix/microsoft/kb3191938.md) | Jun 13, 2017 |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 (64-bit editions) |  | [KB3191938](https://patchblox.com/security/data/fix/microsoft/kb3191938.md) | Jun 13, 2017 |
| Microsoft | Microsoft Outlook 2016 (32-bit edition) |  | [KB3191932](https://patchblox.com/security/data/fix/microsoft/kb3191932.md) | Jun 13, 2017 |
| Microsoft | Microsoft Outlook 2016 (64-bit edition) |  | [KB3191932](https://patchblox.com/security/data/fix/microsoft/kb3191932.md) | Jun 13, 2017 |

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Data as of 2026-11-07T12:40:37Z 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