# CVE-2018-8335: Windows SMB Denial of Service Vulnerability CVE-2018-8335 is fixed in 21 products on 1 platform, first by KB4457131, released September 11, 2018. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2018-8335 - Priority: Routine - CVSS: 4.8 (Important) - EPSS: 0.0900 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Less Likely - Published: Sep 11, 2018 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8335 ## Description

A denial of service vulnerability exists in the Microsoft Server Block Message (SMB) when an 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 1607 for 32-bit Systems | 14393.2485 | [KB4457131](https://patchblox.com/security/data/fix/microsoft/kb4457131.md) | Sep 11, 2018 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.2485 | [KB4457131](https://patchblox.com/security/data/fix/microsoft/kb4457131.md) | Sep 11, 2018 | | Microsoft | Windows 10 Version 1703 for 32-bit Systems | 15063.1324 | [KB4457138](https://patchblox.com/security/data/fix/microsoft/kb4457138.md) | Sep 11, 2018 | | Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.1324 | [KB4457138](https://patchblox.com/security/data/fix/microsoft/kb4457138.md) | Sep 11, 2018 | | Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.665 | [KB4457142](https://patchblox.com/security/data/fix/microsoft/kb4457142.md) | Sep 11, 2018 | | Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.665 | [KB4457142](https://patchblox.com/security/data/fix/microsoft/kb4457142.md) | Sep 11, 2018 | | Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.285 | [KB4457128](https://patchblox.com/security/data/fix/microsoft/kb4457128.md) | Sep 11, 2018 | | Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.285 | [KB4457128](https://patchblox.com/security/data/fix/microsoft/kb4457128.md) | Sep 11, 2018 | | Microsoft | Windows 10 for 32-bit Systems | 10240.17976 | [KB4457132](https://patchblox.com/security/data/fix/microsoft/kb4457132.md) | Sep 11, 2018 | | Microsoft | Windows 10 for x64-based Systems | 10240.17976 | [KB4457132](https://patchblox.com/security/data/fix/microsoft/kb4457132.md) | Sep 11, 2018 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4457129](https://patchblox.com/security/data/fix/microsoft/kb4457129.md) | Sep 11, 2018 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4457143](https://patchblox.com/security/data/fix/microsoft/kb4457143.md) | Sep 11, 2018 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4457129](https://patchblox.com/security/data/fix/microsoft/kb4457129.md) | Sep 11, 2018 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4457143](https://patchblox.com/security/data/fix/microsoft/kb4457143.md) | Sep 11, 2018 | | Microsoft | Windows RT 8.1 | | [KB4457129](https://patchblox.com/security/data/fix/microsoft/kb4457129.md) | Sep 11, 2018 | | Microsoft | Windows Server 2012 | | [KB4457135](https://patchblox.com/security/data/fix/microsoft/kb4457135.md) | Sep 11, 2018 | | Microsoft | Windows Server 2012 | | [KB4457140](https://patchblox.com/security/data/fix/microsoft/kb4457140.md) | Sep 11, 2018 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4457135](https://patchblox.com/security/data/fix/microsoft/kb4457135.md) | Sep 11, 2018 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4457140](https://patchblox.com/security/data/fix/microsoft/kb4457140.md) | Sep 11, 2018 | | Microsoft | Windows Server 2012 R2 | | [KB4457129](https://patchblox.com/security/data/fix/microsoft/kb4457129.md) | Sep 11, 2018 | | Microsoft | Windows Server 2012 R2 | | [KB4457143](https://patchblox.com/security/data/fix/microsoft/kb4457143.md) | Sep 11, 2018 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4457129](https://patchblox.com/security/data/fix/microsoft/kb4457129.md) | Sep 11, 2018 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4457143](https://patchblox.com/security/data/fix/microsoft/kb4457143.md) | Sep 11, 2018 | | Microsoft | Windows Server 2016 | 14393.2485 | [KB4457131](https://patchblox.com/security/data/fix/microsoft/kb4457131.md) | Sep 11, 2018 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.2485 | [KB4457131](https://patchblox.com/security/data/fix/microsoft/kb4457131.md) | Sep 11, 2018 | | Microsoft | Windows Server, version 1709 (Server Core Installation) | 16299.665 | [KB4457142](https://patchblox.com/security/data/fix/microsoft/kb4457142.md) | Sep 11, 2018 | | Microsoft | Windows Server, version 1803 (Server Core Installation) | 17134.285 | [KB4457128](https://patchblox.com/security/data/fix/microsoft/kb4457128.md) | Sep 11, 2018 | --- Data as of 2026-11-07T06:34:28Z 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