Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability
Priority MEDIUM 41Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03946 90th percentileScored 2026-11-07
Fix Fixed Windows Server 2019 (Microsoft): publicationWindows Server 2019 (Server Core installation) (Microsoft): publication+6 more products
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Windows Server 2019 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2016 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 | 6.2.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 R2 | 6.3.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.0 to before publication | publication | Patch available | CNA |
- Windows Server 2019 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2016 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2016 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 VendorMicrosoft Affected 6.2.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 (Server Core installation) VendorMicrosoft Affected 6.2.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 R2 VendorMicrosoft Affected 6.3.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 R2 (Server Core installation) VendorMicrosoft Affected 6.3.0 to before publication Fixed in publication Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* | r2 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
- cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Versions r2 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Remediation
- Fix · CNA Windows Server 2019 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2019 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2016 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2016 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 R2 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 R2 (Server Core installation) (Microsoft) Fixed in publication
Timeline
- 2026-10-02 Threatist record created from CVE-2020-1466
- 2026-10-03 Alias added: GHSA-9fj9-5r8v-mh44
More Microsoft Windows Server 2012 vulnerabilities
- TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2020-01431 Netlogon Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 10.0
- TI-2020-01310 Improper input validation in Microsoft Windows Server KEVCVSS 3.1CRITICAL 10.0
- TI-2017-06077 Microsoft Windows XP SP3, Windows XP x64 XP2, Windows Server 2003 SP2, Windows Vista… KEVCVSS 3.1CRITICAL 9.8
- TI-2015-01465 HTTP.sys in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8, Windows 8.1… KEVCVSS 3.1CRITICAL 9.8
- TI-2020-01009 Improper input validation in Microsoft Windows Server KEVCVSS 3.1CRITICAL 9.0
Sources
- CVE-2020-1466 · CVE Program
- CVE-2020-1466 · NVD
- FIRST EPSS
- GHSA-9fj9-5r8v-mh44 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences