# CVE-2017-8686: Windows DHCP Server Remote Code Execution Vulnerability

CVE-2017-8686 is fixed in 6 products on 1 platform, first by KB4038782, released September 12, 2017. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2017-8686
- Priority: Urgent
- CVSS: 9.8 (Critical)
- EPSS: 0.2750
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Sep 12, 2017
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-8686

## Description

<p>A memory corruption vulnerability exists in the Windows Server DHCP service when an attacker sends specially crafted packets to a DHCP failover server. An attacker who successfully exploited the vulnerability could either run arbitrary code on the DHCP failover server or cause the DHCP service to become nonresponsive.</p> <p>To exploit the vulnerability, an attacker could send a specially crafted packet to a DHCP server. However, the DHCP server must be set to failover mode for the attack to succeed.</p> <p>The security update addresses the vulnerability by correcting how DHCP failover servers handle network packets.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows Server 2012 |  | [KB4038786](https://patchblox.com/security/data/fix/microsoft/kb4038786.md) | Sep 12, 2017 |
| Microsoft | Windows Server 2012 |  | [KB4038799](https://patchblox.com/security/data/fix/microsoft/kb4038799.md) | Sep 12, 2017 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB4038786](https://patchblox.com/security/data/fix/microsoft/kb4038786.md) | Sep 12, 2017 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB4038799](https://patchblox.com/security/data/fix/microsoft/kb4038799.md) | Sep 12, 2017 |
| Microsoft | Windows Server 2012 R2 |  | [KB4038792](https://patchblox.com/security/data/fix/microsoft/kb4038792.md) | Sep 12, 2017 |
| Microsoft | Windows Server 2012 R2 |  | [KB4038793](https://patchblox.com/security/data/fix/microsoft/kb4038793.md) | Sep 12, 2017 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4038792](https://patchblox.com/security/data/fix/microsoft/kb4038792.md) | Sep 12, 2017 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4038793](https://patchblox.com/security/data/fix/microsoft/kb4038793.md) | Sep 12, 2017 |
| Microsoft | Windows Server 2016 | 14393.1715 | [KB4038782](https://patchblox.com/security/data/fix/microsoft/kb4038782.md) | Sep 12, 2017 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.1715 | [KB4038782](https://patchblox.com/security/data/fix/microsoft/kb4038782.md) | Sep 12, 2017 |

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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