CVE-2025-21225: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Windows Server 2016
Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability
AI Analysis
Technical Summary
This vulnerability, identified as CVE-2025-21225, is a type confusion flaw in the Windows Remote Desktop Gateway on Windows Server 2016 (version 10.0.14393.0). It allows an attacker to cause a denial of service (DoS) by exploiting improper handling of resource types. The CVSS 3.1 base score is 5.9 (medium severity), with network attack vector, high attack complexity, no privileges required, no user interaction, and impact limited to availability. Microsoft has released an official fix for this issue.
Potential Impact
Successful exploitation results in denial of service, causing the Remote Desktop Gateway service to become unavailable. There is no impact on confidentiality or integrity. No known exploits are currently in the wild.
Mitigation Recommendations
An official patch is available from Microsoft. Users should apply the update provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21225 to remediate this vulnerability.
CVE-2025-21225: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Windows Server 2016
Description
Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability
CVSS v3.1
Score 5.9medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2025-21225, is a type confusion flaw in the Windows Remote Desktop Gateway on Windows Server 2016 (version 10.0.14393.0). It allows an attacker to cause a denial of service (DoS) by exploiting improper handling of resource types. The CVSS 3.1 base score is 5.9 (medium severity), with network attack vector, high attack complexity, no privileges required, no user interaction, and impact limited to availability. Microsoft has released an official fix for this issue.
Potential Impact
Successful exploitation results in denial of service, causing the Remote Desktop Gateway service to become unavailable. There is no impact on confidentiality or integrity. No known exploits are currently in the wild.
Mitigation Recommendations
An official patch is available from Microsoft. Users should apply the update provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21225 to remediate this vulnerability.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- microsoft
- Date Reserved
- 2024-12-10T23:54:12.918Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21225","vendor":"Microsoft"}]
Threat ID: 68c0bd4d9ed239a66badea80
Added to database: 09/09/2025, 23:50:37 UTC
Last enriched: 06/10/2026, 09:43:20 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 87
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