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

> An attacker can cause the Windows Remote Desktop Gateway service to stop responding by sending specially crafted RDP requests.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Aug 2020
- **Updated:** 1 Oct 2024
- **Also known as:** GHSA-9fj9-5r8v-mh44

## What is CVE-2020-1466?

CVE-2020-1466 is a high-severity denial of service vulnerability in Microsoft Windows Server 2012, published on 17 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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.
To exploit this vulnerability, an attacker would need to run a specially crafted application against a server which provides RD Gateway services.
The update addresses the vulnerability by correcting how RD Gateway handles connection requests.

## Which versions are affected by CVE-2020-1466?

It affects 3 products.


Products: Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019.

## How do I fix CVE-2020-1466?

No fix has been published for CVE-2020-1466 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-1466 being exploited?

There is no known exploitation of CVE-2020-1466 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Windows Server 2012

- [CVE-2025-59287](https://insights.sbomify.com/CVE-2025-59287/): Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2026-69595](https://insights.sbomify.com/CVE-2026-69595/): Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2026-78445](https://insights.sbomify.com/CVE-2026-78445/): Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2026-41089](https://insights.sbomify.com/CVE-2026-41089/): Windows Netlogon Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2024-43639](https://insights.sbomify.com/CVE-2024-43639/): Windows KDC Proxy Remote Code Execution Vulnerability (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-1466 and fix it if it is affected.

What it is: CVE-2020-1466 is a high-severity denial of service vulnerability in Microsoft Windows Server 2012, published on 17 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-1466 in the wild and no public exploit code.

Affected product: Microsoft Windows Server 2012. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-1466/ (Markdown: https://insights.sbomify.com/CVE-2020-1466/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-1466
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-1466
- OSV: https://osv.dev/vulnerability/CVE-2020-1466

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-1466/
Summaries are generated and may contain mistakes; the official description above is the record.