# CVE-2020-16863: Windows Remote Desktop Service Denial of Service Vulnerability

CVE-2020-16863 is fixed in 4 products on 1 platform, first by KB4580345, released October 13, 2020. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2020-16863
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0585
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Oct 13, 2020
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-16863

## Description

<p>A denial of service vulnerability exists in Windows Remote Desktop Service 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 Remote Desktop 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 Remote Desktop Service.</p> <p>The update addresses the vulnerability by correcting how Remote Desktop Service handles connection requests.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 7 for 32-bit Systems Service Pack 1 |  | [KB4580345](https://patchblox.com/security/data/fix/microsoft/kb4580345.md) | Oct 13, 2020 |
| Microsoft | Windows 7 for 32-bit Systems Service Pack 1 |  | [KB4580387](https://patchblox.com/security/data/fix/microsoft/kb4580387.md) | Oct 13, 2020 |
| Microsoft | Windows 7 for x64-based Systems Service Pack 1 |  | [KB4580345](https://patchblox.com/security/data/fix/microsoft/kb4580345.md) | Oct 13, 2020 |
| Microsoft | Windows 7 for x64-based Systems Service Pack 1 |  | [KB4580387](https://patchblox.com/security/data/fix/microsoft/kb4580387.md) | Oct 13, 2020 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB4580345](https://patchblox.com/security/data/fix/microsoft/kb4580345.md) | Oct 13, 2020 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB4580387](https://patchblox.com/security/data/fix/microsoft/kb4580387.md) | Oct 13, 2020 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB4580345](https://patchblox.com/security/data/fix/microsoft/kb4580345.md) | Oct 13, 2020 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB4580387](https://patchblox.com/security/data/fix/microsoft/kb4580387.md) | Oct 13, 2020 |

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Data as of 2026-11-09T07:25:28Z 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

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