# CVE-2017-8572: Microsoft Outlook Information Disclosure Vulnerability

CVE-2017-8572 is fixed in 8 products on 1 platform, first by KB3213643, released July 27, 2017. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2017-8572
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.1259
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jul 27, 2017
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-8572

## Description

<p>An information disclosure vulnerability exists when Microsoft Outlook fails to properly validate authentication requests.</p> <p>To exploit the vulnerability an attacker would have to trick a user into browsing to a malicious website or to an SMB or UNC path destination. Alternatively the attacker could convince a user to load a malicious document that initiates an NTLM validation request without the consent of the user. An attacker who successfully tricked a user into disclosing the user's NTLM hash could attempt a brute-force attack to disclose the corresponding hash password.</p> <p>The security update addresses the vulnerability by correcting how Outlook validates authentication requests.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Outlook 2007 Service Pack 3 |  | [KB3213643](https://patchblox.com/security/data/fix/microsoft/kb3213643.md) | Jul 27, 2017 |
| Microsoft | Microsoft Outlook 2010 Service Pack 2 (32-bit editions) |  | [KB2956078](https://patchblox.com/security/data/fix/microsoft/kb2956078.md) | Jul 27, 2017 |
| Microsoft | Microsoft Outlook 2010 Service Pack 2 (64-bit editions) |  | [KB2956078](https://patchblox.com/security/data/fix/microsoft/kb2956078.md) | Jul 27, 2017 |
| Microsoft | Microsoft Outlook 2013 RT Service Pack 1 |  | [KB4011078](https://patchblox.com/security/data/fix/microsoft/kb4011078.md) | Jul 27, 2017 |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 (32-bit editions) |  | [KB4011078](https://patchblox.com/security/data/fix/microsoft/kb4011078.md) | Jul 27, 2017 |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 (64-bit editions) |  | [KB4011078](https://patchblox.com/security/data/fix/microsoft/kb4011078.md) | Jul 27, 2017 |
| Microsoft | Microsoft Outlook 2016 (32-bit edition) |  | [KB4011052](https://patchblox.com/security/data/fix/microsoft/kb4011052.md) | Jul 27, 2017 |
| Microsoft | Microsoft Outlook 2016 (64-bit edition) |  | [KB4011052](https://patchblox.com/security/data/fix/microsoft/kb4011052.md) | Jul 27, 2017 |

---

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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.