# CVE-2020-1466: Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability

CVE-2020-1466 is fixed in 8 products on 1 platform, first by KB4571694, released August 11, 2020. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2020-1466
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0395
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: N/A
- Published: Aug 11, 2020
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1466

## Description

<p>A denial of service vulnerability exists in Windows Remote Desktop Gateway (RD Gateway) when an attacker connects to the target system using RDP and sends specially crafted requests. An attacker who successfully exploited this vulnerability could cause the RD Gateway service on the target system to stop responding.</p> <p>To exploit this vulnerability, an attacker would need to run a specially crafted application against a server which provides RD Gateway services.</p> <p>The update addresses the vulnerability by correcting how RD Gateway handles connection requests.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows Server 2012 |  | [KB4571702](https://patchblox.com/security/data/fix/microsoft/kb4571702.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2012 |  | [KB4571736](https://patchblox.com/security/data/fix/microsoft/kb4571736.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB4571702](https://patchblox.com/security/data/fix/microsoft/kb4571702.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB4571736](https://patchblox.com/security/data/fix/microsoft/kb4571736.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2012 R2 |  | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2012 R2 |  | [KB4571723](https://patchblox.com/security/data/fix/microsoft/kb4571723.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4571723](https://patchblox.com/security/data/fix/microsoft/kb4571723.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2016 | 14393.3866 | [KB4571694](https://patchblox.com/security/data/fix/microsoft/kb4571694.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.3866 | [KB4571694](https://patchblox.com/security/data/fix/microsoft/kb4571694.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2019 | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 |

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Data as of 2026-11-08T06:59:42Z 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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