CVE-2019-0820

.NET Framework and .NET Core Denial of Service Vulnerability

CVE-2019-0820 is fixed in 108 products on 2 platforms, first by KB4494440, released May 14, 2019. It is not reported as exploited. Patch Radar priority: High.

HighFixed on 2 platforms
CVSS
7.5
Important
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0572
93rd percentile

<p>A denial of service vulnerability exists when .NET Framework and .NET Core improperly process RegEx strings. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET application.</p> <p>A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to a .NET Framework (or .NET core) application.</p> <p>The update addresses the vulnerability by correcting how .NET Framework and .NET Core applications handle RegEx string processing.</p>

Where it's fixed

ProductFixed inFixReleased
Microsoft
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2 KB4499409 May 14, 2019
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2 KB4498964 May 14, 2019
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2 KB4499409 May 14, 2019
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2 KB4498964 May 14, 2019
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2 KB4499409 May 14, 2019
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2 KB4498964 May 14, 2019
Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2 KB4499409 May 14, 2019
Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2 KB4498964 May 14, 2019
Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2 KB4499409 May 14, 2019
Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2 KB4498964 May 14, 2019
Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2 KB4499409 May 14, 2019
Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2 KB4498964 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1607 for 32-bit Systems 14393.2969 KB4494440 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1607 for x64-based Systems 14393.2969 KB4494440 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1703 for 32-bit Systems 15063.1805 KB4499181 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1703 for x64-based Systems 15063.1805 KB4499181 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1709 for 32-bit Systems 16299.1146 KB4499179 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1709 for ARM64-based Systems 16299.1146 KB4499179 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1709 for x64-based Systems 16299.1146 KB4499179 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1803 for 32-bit Systems 17134.765 KB4499167 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1803 for ARM64-based Systems 17134.765 KB4499167 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1803 for x64-based Systems 17134.765 KB4499167 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1809 for 32-bit Systems KB4499405 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1809 for x64-based Systems KB4499405 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1903 for 32-bit Systems KB4495620 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 Version 1903 for x64-based Systems KB4495620 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 for 32-bit Systems 10240.18215 KB4499154 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 10 for x64-based Systems 10240.18215 KB4499154 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 8.1 for 32-bit systems KB4498963 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 8.1 for 32-bit systems KB4499408 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 8.1 for x64-based systems KB4498963 May 14, 2019
Microsoft .NET Framework 3.5 on Windows 8.1 for x64-based systems KB4499408 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2012 KB4499407 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2012 KB4498962 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation) KB4499407 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation) KB4498962 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2012 R2 KB4498963 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2012 R2 KB4499408 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation) KB4498963 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation) KB4499408 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2016 14393.2969 KB4494440 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2016 (Server Core installation) 14393.2969 KB4494440 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2019 KB4499405 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server 2019 (Server Core installation) KB4499405 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server, version 1803 (Server Core Installation) 17134.765 KB4499167 May 14, 2019
Microsoft .NET Framework 3.5 on Windows Server, version 1903 (Server Core installation) KB4495620 May 14, 2019
Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) KB4498961 May 14, 2019
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) KB4499406 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows 7 for 32-bit Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows 7 for 32-bit Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows 7 for x64-based Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows 7 for x64-based Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows 8.1 for 32-bit systems KB4498963 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows 8.1 for 32-bit systems KB4499408 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows 8.1 for x64-based systems KB4498963 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows 8.1 for x64-based systems KB4499408 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows RT 8.1 KB4499408 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) KB4498961 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) KB4499406 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2008 for 32-bit Systems Service Pack 2 KB4499409 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2008 for 32-bit Systems Service Pack 2 KB4498964 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2008 for x64-based Systems Service Pack 2 KB4499409 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2008 for x64-based Systems Service Pack 2 KB4498964 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2012 KB4499407 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2012 KB4498962 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2012 (Server Core installation) KB4499407 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2012 (Server Core installation) KB4498962 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 KB4498963 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 KB4499408 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 (Server Core installation) KB4498963 May 14, 2019
Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 (Server Core installation) KB4499408 May 14, 2019
Microsoft .NET Framework 4.6 on Windows Server 2008 for 32-bit Systems Service Pack 2 KB4499409 May 14, 2019
Microsoft .NET Framework 4.6 on Windows Server 2008 for 32-bit Systems Service Pack 2 KB4498964 May 14, 2019
Microsoft .NET Framework 4.6 on Windows Server 2008 for x64-based Systems Service Pack 2 KB4499409 May 14, 2019
Microsoft .NET Framework 4.6 on Windows Server 2008 for x64-based Systems Service Pack 2 KB4498964 May 14, 2019
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 14393.2969 KB4494440 May 14, 2019
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation) 14393.2969 KB4494440 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for 32-bit Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for 32-bit Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for x64-based Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for x64-based Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for 32-bit systems KB4498963 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for 32-bit systems KB4499408 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for x64-based systems KB4498963 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for x64-based systems KB4499408 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows RT 8.1 KB4499408 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) KB4498961 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) KB4499406 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 KB4499407 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 KB4498962 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation) KB4499407 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation) KB4498962 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 KB4498963 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 KB4499408 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation) KB4498963 May 14, 2019
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation) KB4499408 May 14, 2019
Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for 32-bit Systems 17134.765 KB4499167 May 14, 2019
Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for ARM64-based Systems 17134.765 KB4499167 May 14, 2019
Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for x64-based Systems 17134.765 KB4499167 May 14, 2019
Microsoft .NET Framework 4.7.2 on Windows Server 2019 KB4499405 May 14, 2019
Microsoft .NET Framework 4.7.2 on Windows Server 2019 (Server Core installation) KB4499405 May 14, 2019
Microsoft .NET Framework 4.7.2 on Windows Server, version 1803 (Server Core Installation) 17134.765 KB4499167 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems KB4495610 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems KB4495610 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1703 for 32-bit Systems KB4495611 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1703 for x64-based Systems KB4495611 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems KB4495613 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems KB4495613 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems KB4495616 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems KB4495616 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1809 for 32-bit Systems KB4499405 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1809 for x64-based Systems KB4499405 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1903 for 32-bit Systems KB4495620 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 10 Version 1903 for x64-based Systems KB4495620 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems KB4498963 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems KB4499408 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems KB4498963 May 14, 2019
Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems KB4499408 May 14, 2019
Microsoft .NET Framework 4.8 on Windows RT 8.1 KB4499408 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 KB4498961 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 KB4499406 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) KB4498961 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) KB4499406 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2012 KB4499407 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2012 KB4498962 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation) KB4499407 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation) KB4498962 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2012 R2 KB4498963 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2012 R2 KB4499408 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation) KB4498963 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation) KB4499408 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2016 KB4495610 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation) KB4495610 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2019 KB4499405 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server 2019 (Server Core installation) KB4499405 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation) KB4495616 May 14, 2019
Microsoft .NET Framework 4.8 on Windows Server, version 1903 (Server Core installation) KB4495620 May 14, 2019
Linux
dotnet · RHEL 8 0:2.1.507-2.el8_0 RHSA-2019:1259 May 22, 2019
dotnet · ol 8 0:2.1.507-2.el8_0 ELSA-2019-1259 Jul 30, 2019
dotnet-host · RHEL 8 0:2.1.11-2.el8_0 RHSA-2019:1259 May 22, 2019
dotnet-host · ol 8 0:2.1.11-2.el8_0 ELSA-2019-1259 Jul 30, 2019
dotnet-host-fxr-2.1 · RHEL 8 0:2.1.11-2.el8_0 RHSA-2019:1259 May 22, 2019
dotnet-host-fxr-2.1 · ol 8 0:2.1.11-2.el8_0 ELSA-2019-1259 Jul 30, 2019
dotnet-runtime-2.1 · RHEL 8 0:2.1.11-2.el8_0 RHSA-2019:1259 May 22, 2019
dotnet-runtime-2.1 · ol 8 0:2.1.11-2.el8_0 ELSA-2019-1259 Jul 30, 2019
dotnet-sdk-2.1 · RHEL 8 0:2.1.507-2.el8_0 RHSA-2019:1259 May 22, 2019
dotnet-sdk-2.1 · ol 8 0:2.1.507-2.el8_0 ELSA-2019-1259 Jul 30, 2019
dotnet-sdk-2.1.5xx · RHEL 8 0:2.1.507-2.el8_0 RHSA-2019:1259 May 22, 2019
dotnet-sdk-2.1.5xx · ol 8 0:2.1.507-2.el8_0 ELSA-2019-1259 Jul 30, 2019

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.