# CVE-2019-0811: Windows DNS Server Denial of Service Vulnerability

CVE-2019-0811 is fixed in 8 products on 1 platform, first by KB4507460, released July 9, 2019. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2019-0811
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0450
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jul 9, 2019
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-0811

## Description

<p>A denial of service vulnerability exists in Windows DNS Server when it fails to properly handle DNS queries. An attacker who successfully exploited this vulnerability could cause the DNS Server service to become nonresponsive.</p> <p>To exploit the vulnerability, an unauthenticated attacker could send malicious DNS queries to an affected server, resulting in a denial of service. However, the DNS server must be configured to use DNS Analytical Logging for the attack to succeed.</p> <p>The update addresses the vulnerability by correcting how Windows DNS Server processes DNS queries.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows Server 2012 R2 |  | [KB4507457](https://patchblox.com/security/data/fix/microsoft/kb4507457.md) | Jul 9, 2019 |
| Microsoft | Windows Server 2012 R2 |  | [KB4507448](https://patchblox.com/security/data/fix/microsoft/kb4507448.md) | Jul 9, 2019 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4507457](https://patchblox.com/security/data/fix/microsoft/kb4507457.md) | Jul 9, 2019 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4507448](https://patchblox.com/security/data/fix/microsoft/kb4507448.md) | Jul 9, 2019 |
| Microsoft | Windows Server 2016 | 14393.3085 | [KB4507460](https://patchblox.com/security/data/fix/microsoft/kb4507460.md) | Jul 9, 2019 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.3085 | [KB4507460](https://patchblox.com/security/data/fix/microsoft/kb4507460.md) | Jul 9, 2019 |
| Microsoft | Windows Server 2019 | 17763.615 | [KB4507469](https://patchblox.com/security/data/fix/microsoft/kb4507469.md) | Jul 9, 2019 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.615 | [KB4507469](https://patchblox.com/security/data/fix/microsoft/kb4507469.md) | Jul 9, 2019 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) | 17134.885 | [KB4507435](https://patchblox.com/security/data/fix/microsoft/kb4507435.md) | Jul 9, 2019 |
| Microsoft | Windows Server, version 1903 (Server Core installation) | 18362.239 | [KB4507453](https://patchblox.com/security/data/fix/microsoft/kb4507453.md) | Jul 9, 2019 |

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Data as of 2026-11-07T18:46:35Z 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

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