# CVE-2017-11781: W - SMB - DOS Authenticated CVE-2017-11781 is fixed in 27 products on 1 platform, first by KB4041689, released October 10, 2017. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2017-11781 - Priority: Routine - CVSS: 5.9 (Important) - EPSS: 0.1440 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Unlikely - Published: Oct 10, 2017 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-11781 ## Description

A denial of service vulnerability exists in the Microsoft Server Block Message (SMB) when an authenticated attacker sends specially crafted requests to the server. An attacker who exploited this vulnerability could cause the affected system to crash. To attempt to exploit this issue, an attacker would need to send specially crafted SMB requests to the target system.

Note that the denial of service vulnerability would not allow an attacker to execute code or to elevate their user rights, but it could cause the affected system to stop accepting requests.

The security update addresses the vulnerability by correcting the manner in which SMB handles specially crafted client requests.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1511 for 32-bit Systems | 10586.1176 | [KB4041689](https://patchblox.com/security/data/fix/microsoft/kb4041689.md) | Oct 10, 2017 | | Microsoft | Windows 10 Version 1511 for x64-based Systems | 10586.1176 | [KB4041689](https://patchblox.com/security/data/fix/microsoft/kb4041689.md) | Oct 10, 2017 | | 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 10 Version 1703 for 32-bit Systems | 15063.674 | [KB4041676](https://patchblox.com/security/data/fix/microsoft/kb4041676.md) | Oct 10, 2017 | | Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.674 | [KB4041676](https://patchblox.com/security/data/fix/microsoft/kb4041676.md) | Oct 10, 2017 | | Microsoft | Windows 10 for 32-bit Systems | 10240.17643 | [KB4042895](https://patchblox.com/security/data/fix/microsoft/kb4042895.md) | Oct 10, 2017 | | Microsoft | Windows 10 for x64-based Systems | 10240.17643 | [KB4042895](https://patchblox.com/security/data/fix/microsoft/kb4042895.md) | Oct 10, 2017 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4041681](https://patchblox.com/security/data/fix/microsoft/kb4041681.md) | Oct 10, 2017 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4041678](https://patchblox.com/security/data/fix/microsoft/kb4041678.md) | Oct 10, 2017 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4041681](https://patchblox.com/security/data/fix/microsoft/kb4041681.md) | Oct 10, 2017 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4041678](https://patchblox.com/security/data/fix/microsoft/kb4041678.md) | Oct 10, 2017 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4041693](https://patchblox.com/security/data/fix/microsoft/kb4041693.md) | Oct 10, 2017 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4041687](https://patchblox.com/security/data/fix/microsoft/kb4041687.md) | Oct 10, 2017 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4041693](https://patchblox.com/security/data/fix/microsoft/kb4041693.md) | Oct 10, 2017 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4041687](https://patchblox.com/security/data/fix/microsoft/kb4041687.md) | Oct 10, 2017 | | Microsoft | Windows RT 8.1 | | [KB4041693](https://patchblox.com/security/data/fix/microsoft/kb4041693.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4041681](https://patchblox.com/security/data/fix/microsoft/kb4041681.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4041678](https://patchblox.com/security/data/fix/microsoft/kb4041678.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4041681](https://patchblox.com/security/data/fix/microsoft/kb4041681.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4041678](https://patchblox.com/security/data/fix/microsoft/kb4041678.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4041681](https://patchblox.com/security/data/fix/microsoft/kb4041681.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4041678](https://patchblox.com/security/data/fix/microsoft/kb4041678.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4041995](https://patchblox.com/security/data/fix/microsoft/kb4041995.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4041995](https://patchblox.com/security/data/fix/microsoft/kb4041995.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 for Itanium-Based Systems Service Pack 2 | | [KB4041995](https://patchblox.com/security/data/fix/microsoft/kb4041995.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4041995](https://patchblox.com/security/data/fix/microsoft/kb4041995.md) | Oct 10, 2017 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4041995](https://patchblox.com/security/data/fix/microsoft/kb4041995.md) | Oct 10, 2017 | | Microsoft | Windows Server 2012 | | [KB4041690](https://patchblox.com/security/data/fix/microsoft/kb4041690.md) | Oct 10, 2017 | | Microsoft | Windows Server 2012 | | [KB4041679](https://patchblox.com/security/data/fix/microsoft/kb4041679.md) | Oct 10, 2017 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4041690](https://patchblox.com/security/data/fix/microsoft/kb4041690.md) | Oct 10, 2017 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4041679](https://patchblox.com/security/data/fix/microsoft/kb4041679.md) | Oct 10, 2017 | | Microsoft | Windows Server 2012 R2 | | [KB4041693](https://patchblox.com/security/data/fix/microsoft/kb4041693.md) | Oct 10, 2017 | | Microsoft | Windows Server 2012 R2 | | [KB4041687](https://patchblox.com/security/data/fix/microsoft/kb4041687.md) | Oct 10, 2017 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4041693](https://patchblox.com/security/data/fix/microsoft/kb4041693.md) | Oct 10, 2017 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4041687](https://patchblox.com/security/data/fix/microsoft/kb4041687.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. 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