| CVE Number | Vulnerability | Product | Severity | Date |
|---|---|---|---|---|
| CVE-2026-23666 | .NET Framework Denial of Service Vulnerability | Windows 10, Windows 11, Windows Server | Critical | 27-04-2026 |
Technical Information
An unauthorized attacker can exploit improper handling of exceptional conditions in the .NET Framework to trigger a denial-of-service condition over a network by sending crafted input that causes the application to fail or become unresponsive.
Patch release date: Apr 14, 2026
Further information on this vulnerability is available at : CVE-2026-23666
Affected Software
Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems,Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems,
Microsoft .NET Framework 4.8 on Windows Server 2012,
Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation),
Microsoft .NET Framework 4.8 on Windows Server 2012 R2,
Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation),
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems,
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022,
Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 (Server Core installation),
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems,
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems,
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems,
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems,
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems,
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012,
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation),
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2,
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation),
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 (Server Core installation),
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for 32-bit Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for x64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 22H2 for ARM64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 22H2 for x64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for x64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for ARM64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for 32-bit Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for ARM systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for x64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for ARM64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for x64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022, 23H2 Edition (Server Core installation),
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for ARM64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for x64-based Systems,
Microsoft .NET Framework 3.5 on Windows Server 2012,
Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation),
Microsoft .NET Framework 3.5 on Windows Server 2012 R2,
Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation),
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 (Server Core installation),
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H1 for x64-based Systems,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025,
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems