# CVE-2018-0749: SMB Server Elevation of Privilege Vulnerability CVE-2018-0749 is fixed in 29 products on 1 platform, first by KB4056888, released January 3, 2018. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2018-0749 - Priority: Routine - CVSS: 6.6 (Important) - EPSS: 0.0321 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Less Likely - Published: Jan 18, 2018 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-0749 ## Description

An elevation of privilege vulnerability exists in the Microsoft Server Message Block (SMB) Server when an attacker with valid credentials attempts to open a specially crafted file over the SMB protocol on the same machine. An attacker who successfully exploited this vulnerability could bypass certain security checks in the operating system.

To exploit the vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system.

The update addresses the vulnerability by correcting how Windows SMB Server handles such specially crafted files.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1511 for 32-bit Systems | 10586.1356 | [KB4056888](https://patchblox.com/security/data/fix/microsoft/kb4056888.md) | Jan 3, 2018 | | Microsoft | Windows 10 Version 1511 for x64-based Systems | 10586.1356 | [KB4056888](https://patchblox.com/security/data/fix/microsoft/kb4056888.md) | Jan 3, 2018 | | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.2007 | [KB4056890](https://patchblox.com/security/data/fix/microsoft/kb4056890.md) | Jan 3, 2018 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.2007 | [KB4056890](https://patchblox.com/security/data/fix/microsoft/kb4056890.md) | Jan 3, 2018 | | Microsoft | Windows 10 Version 1703 for 32-bit Systems | 15063.850 | [KB4056891](https://patchblox.com/security/data/fix/microsoft/kb4056891.md) | Jan 3, 2018 | | Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.850 | [KB4056891](https://patchblox.com/security/data/fix/microsoft/kb4056891.md) | Jan 3, 2018 | | Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.192 | [KB4056892](https://patchblox.com/security/data/fix/microsoft/kb4056892.md) | Jan 3, 2018 | | Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.192 | [KB4056892](https://patchblox.com/security/data/fix/microsoft/kb4056892.md) | Jan 3, 2018 | | Microsoft | Windows 10 for 32-bit Systems | 10240.17738 | [KB4056893](https://patchblox.com/security/data/fix/microsoft/kb4056893.md) | Jan 3, 2018 | | Microsoft | Windows 10 for x64-based Systems | 10240.17738 | [KB4056893](https://patchblox.com/security/data/fix/microsoft/kb4056893.md) | Jan 3, 2018 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4056897](https://patchblox.com/security/data/fix/microsoft/kb4056897.md) | Jan 18, 2018 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4056894](https://patchblox.com/security/data/fix/microsoft/kb4056894.md) | Jan 18, 2018 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4056897](https://patchblox.com/security/data/fix/microsoft/kb4056897.md) | Jan 18, 2018 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4056894](https://patchblox.com/security/data/fix/microsoft/kb4056894.md) | Jan 18, 2018 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4056898](https://patchblox.com/security/data/fix/microsoft/kb4056898.md) | Jan 18, 2018 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4056895](https://patchblox.com/security/data/fix/microsoft/kb4056895.md) | Jan 18, 2018 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4056898](https://patchblox.com/security/data/fix/microsoft/kb4056898.md) | Jan 18, 2018 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4056895](https://patchblox.com/security/data/fix/microsoft/kb4056895.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4056897](https://patchblox.com/security/data/fix/microsoft/kb4056897.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4056894](https://patchblox.com/security/data/fix/microsoft/kb4056894.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4056897](https://patchblox.com/security/data/fix/microsoft/kb4056897.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4056894](https://patchblox.com/security/data/fix/microsoft/kb4056894.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4056897](https://patchblox.com/security/data/fix/microsoft/kb4056897.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4056894](https://patchblox.com/security/data/fix/microsoft/kb4056894.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4056759](https://patchblox.com/security/data/fix/microsoft/kb4056759.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4056759](https://patchblox.com/security/data/fix/microsoft/kb4056759.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 for Itanium-Based Systems Service Pack 2 | | [KB4056759](https://patchblox.com/security/data/fix/microsoft/kb4056759.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4056759](https://patchblox.com/security/data/fix/microsoft/kb4056759.md) | Jan 18, 2018 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4056759](https://patchblox.com/security/data/fix/microsoft/kb4056759.md) | Jan 18, 2018 | | Microsoft | Windows Server 2012 | | [KB4056899](https://patchblox.com/security/data/fix/microsoft/kb4056899.md) | Jan 18, 2018 | | Microsoft | Windows Server 2012 | | [KB4056896](https://patchblox.com/security/data/fix/microsoft/kb4056896.md) | Jan 18, 2018 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4056899](https://patchblox.com/security/data/fix/microsoft/kb4056899.md) | Jan 18, 2018 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4056896](https://patchblox.com/security/data/fix/microsoft/kb4056896.md) | Jan 18, 2018 | | Microsoft | Windows Server 2012 R2 | | [KB4056898](https://patchblox.com/security/data/fix/microsoft/kb4056898.md) | Jan 18, 2018 | | Microsoft | Windows Server 2012 R2 | | [KB4056895](https://patchblox.com/security/data/fix/microsoft/kb4056895.md) | Jan 18, 2018 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4056898](https://patchblox.com/security/data/fix/microsoft/kb4056898.md) | Jan 18, 2018 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4056895](https://patchblox.com/security/data/fix/microsoft/kb4056895.md) | Jan 18, 2018 | | Microsoft | Windows Server 2016 | 14393.2007 | [KB4056890](https://patchblox.com/security/data/fix/microsoft/kb4056890.md) | Jan 3, 2018 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.2007 | [KB4056890](https://patchblox.com/security/data/fix/microsoft/kb4056890.md) | Jan 3, 2018 | | Microsoft | Windows Server, version 1709 (Server Core Installation) | 16299.192 | [KB4056892](https://patchblox.com/security/data/fix/microsoft/kb4056892.md) | Jan 3, 2018 | --- Data as of 2026-11-11T01:43:54Z UTC. 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