# CVE-2016-3226: Active Directory Denial of Service Vulnerability

CVE-2016-3226 is fixed in 6 products on 1 platform, first by KB3160352, released June 16, 2016. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2016-3226
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.1070
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Unlikely
- Published: Jun 16, 2016
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2016-3226

## Description

<p>A denial of service vulnerability exists in Active Directory when an authenticated attacker creates multiple machine accounts. An attacker who successfully exploited this vulnerability could cause the Active Directory service to become nonresponsive.</p> <p>To exploit this vulnerability, an attacker must have valid credentials. An attacker could exploit this vulnerability by creating multiple machine accounts, resulting in denial of service.</p> <p>The update addresses the vulnerability by correcting how machine accounts are created.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB3160352](https://patchblox.com/security/data/fix/microsoft/kb3160352.md) | Jun 16, 2016 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB3160352](https://patchblox.com/security/data/fix/microsoft/kb3160352.md) | Jun 16, 2016 |
| Microsoft | Windows Server 2012 |  | [KB3160352](https://patchblox.com/security/data/fix/microsoft/kb3160352.md) | Jun 16, 2016 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB3160352](https://patchblox.com/security/data/fix/microsoft/kb3160352.md) | Jun 16, 2016 |
| Microsoft | Windows Server 2012 R2 |  | [KB3160352](https://patchblox.com/security/data/fix/microsoft/kb3160352.md) | Jun 16, 2016 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB3160352](https://patchblox.com/security/data/fix/microsoft/kb3160352.md) | Jun 16, 2016 |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo