# CVE-2018-8626: Windows DNS Server Heap Overflow Vulnerability CVE-2018-8626 is fixed in 19 products on 1 platform, first by KB4471321, released December 11, 2018. It is not reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2018-8626 - Priority: Urgent - CVSS: 9.8 (Critical) - EPSS: 0.2124 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Less Likely - Published: Dec 11, 2018 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8626 ## Description

A remote code execution vulnerability exists in Windows Domain Name System (DNS) servers when they fail to properly handle requests. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the Local System Account. Windows servers that are configured as DNS servers are at risk from this vulnerability.

To exploit the vulnerability, an unauthenticated attacker could send malicious requests to a Windows DNS server.

The update addresses the vulnerability by modifying how Windows DNS servers handle requests.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.2665 | [KB4471321](https://patchblox.com/security/data/fix/microsoft/kb4471321.md) | Dec 11, 2018 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.2665 | [KB4471321](https://patchblox.com/security/data/fix/microsoft/kb4471321.md) | Dec 11, 2018 | | Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.846 | [KB4471329](https://patchblox.com/security/data/fix/microsoft/kb4471329.md) | Dec 11, 2018 | | Microsoft | Windows 10 Version 1709 for ARM64-based Systems | 16299.846 | [KB4471329](https://patchblox.com/security/data/fix/microsoft/kb4471329.md) | Dec 11, 2018 | | Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.846 | [KB4471329](https://patchblox.com/security/data/fix/microsoft/kb4471329.md) | Dec 11, 2018 | | Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.471 | [KB4471324](https://patchblox.com/security/data/fix/microsoft/kb4471324.md) | Dec 11, 2018 | | Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.471 | [KB4471324](https://patchblox.com/security/data/fix/microsoft/kb4471324.md) | Dec 11, 2018 | | Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.471 | [KB4471324](https://patchblox.com/security/data/fix/microsoft/kb4471324.md) | Dec 11, 2018 | | Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.194 | [KB4471332](https://patchblox.com/security/data/fix/microsoft/kb4471332.md) | Dec 11, 2018 | | Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.194 | [KB4471332](https://patchblox.com/security/data/fix/microsoft/kb4471332.md) | Dec 11, 2018 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.194 | [KB4471332](https://patchblox.com/security/data/fix/microsoft/kb4471332.md) | Dec 11, 2018 | | Microsoft | Windows Server 2012 R2 | | [KB4471320](https://patchblox.com/security/data/fix/microsoft/kb4471320.md) | Dec 11, 2018 | | Microsoft | Windows Server 2012 R2 | | [KB4471322](https://patchblox.com/security/data/fix/microsoft/kb4471322.md) | Dec 11, 2018 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4471320](https://patchblox.com/security/data/fix/microsoft/kb4471320.md) | Dec 11, 2018 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4471322](https://patchblox.com/security/data/fix/microsoft/kb4471322.md) | Dec 11, 2018 | | Microsoft | Windows Server 2016 | 14393.2665 | [KB4471321](https://patchblox.com/security/data/fix/microsoft/kb4471321.md) | Dec 11, 2018 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.2665 | [KB4471321](https://patchblox.com/security/data/fix/microsoft/kb4471321.md) | Dec 11, 2018 | | Microsoft | Windows Server 2019 | 17763.194 | [KB4471332](https://patchblox.com/security/data/fix/microsoft/kb4471332.md) | Dec 11, 2018 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.194 | [KB4471332](https://patchblox.com/security/data/fix/microsoft/kb4471332.md) | Dec 11, 2018 | | Microsoft | Windows Server, version 1709 (Server Core Installation) | 16299.846 | [KB4471329](https://patchblox.com/security/data/fix/microsoft/kb4471329.md) | Dec 11, 2018 | | Microsoft | Windows Server, version 1803 (Server Core Installation) | 17134.471 | [KB4471324](https://patchblox.com/security/data/fix/microsoft/kb4471324.md) | Dec 11, 2018 | --- Data as of 2026-11-07T12:40:37Z 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