# CVE-2017-11782: Windows SMB Elevation of Privilege Vulnerability

CVE-2017-11782 is fixed in 4 products on 1 platform, first by KB4041691, released October 10, 2017. 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-2017-11782
- Priority: Urgent
- CVSS: 7.5 (Important)
- EPSS: 0.0117
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Oct 10, 2017
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-11782

## Description

<p>An elevation of privilege vulnerability exists in the default Windows SMB Server configuration which allows anonymous users to remotely access certain named pipes that are also configured to allow anonymous access to users who are logged on locally. An unauthenticated attacker who successfully exploits this configuration error could remotely send specially crafted requests to certain services that accept requests via named pipes.</p> <p>To exploit the vulnerability, an attacker would have to be able to send SMB messages to an impacted Windows SMB Server for which the attacker does not already have valid credentials, and then identify an unpatched vulnerability in the handling of named pipe requests in one of the impacted services.</p> <p>The update addresses the vulnerability by correcting the Windows SMB Server default configuration.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.1770 | [KB4041691](https://patchblox.com/security/data/fix/microsoft/kb4041691.md) | Oct 10, 2017 |
| Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.1770 | [KB4041691](https://patchblox.com/security/data/fix/microsoft/kb4041691.md) | Oct 10, 2017 |
| Microsoft | Windows Server 2016 | 14393.1770 | [KB4041691](https://patchblox.com/security/data/fix/microsoft/kb4041691.md) | Oct 10, 2017 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.1770 | [KB4041691](https://patchblox.com/security/data/fix/microsoft/kb4041691.md) | Oct 10, 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo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.