.NET Framework and .NET Core Denial of Service Vulnerability
CVE-2019-0820
Security Vulnerability
Released: May 14, 2019
Last updated: May 21, 2019
- Assigning CNA
- Microsoft
- CVE.org link
- CVE-2019-0820
Executive Summary
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.
A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to a .NET Framework (or .NET core) application.
The update addresses the vulnerability by correcting how .NET Framework and .NET Core applications handle RegEx string processing.
Exploitability
The following table provides an exploitability assessment for this vulnerability at the time of original publication.
- Publicly disclosed
- No
- Exploited
- No
- Exploitability assessment
- Exploitation Less Likely
Acknowledgements
Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information.
Security Updates
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle.
Release date Descending
Product
Platform
Impact
Max Severity
Article
Download
Build Number
May 14, 2019
Microsoft .NET Framework 4.8
Windows Server 2012 R2 (Server Core installation)
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows RT 8.1
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows 8.1 for x64-based systems
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows 8.1 for 32-bit systems
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows 10 Version 1903 for 32-bit Systems
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows Server 2019
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows 10 Version 1809 for 32-bit Systems
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows Server 2012 R2 (Server Core installation)
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows Server 2012 R2
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows Server 2012 (Server Core installation)
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows Server 2012
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows Server 2008 for x64-based Systems Service Pack 2
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows Server 2008 for 32-bit Systems Service Pack 2
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows Server 2016
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows 7 for 32-bit Systems Service Pack 1
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows 10 Version 1607 for x64-based Systems
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows 10 Version 1703 for 32-bit Systems
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows 10 Version 1709 for 32-bit Systems
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows 10 Version 1803 for x64-based Systems
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows 10 Version 1709 for x64-based Systems
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.8
Windows 10 Version 1903 for x64-based Systems
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows 7 for x64-based Systems Service Pack 1
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 4.5.2
Windows 7 for 32-bit Systems Service Pack 1
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5.1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5.1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5.1
Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5.1
Windows 7 for x64-based Systems Service Pack 1
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5.1
Windows 7 for 32-bit Systems Service Pack 1
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5
Windows Server 2012 R2 (Server Core installation)
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5
Windows Server 2012 R2
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5
Windows Server 2012 (Server Core installation)
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5
Windows Server 2012
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5
Windows 8.1 for x64-based systems
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5
Windows 8.1 for 32-bit systems
Denial of Service
Important
- -
- -
May 14, 2019
Microsoft .NET Framework 3.5
Windows Server 2016 (Server Core installation)
Denial of Service
Important
- -
May 14, 2019
Microsoft .NET Framework 3.5
Windows Server 2016
Denial of Service
Important
- -
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Disclaimer
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Revisions
version
revisionDate
description
2.0
May 21, 2019
Revised the Security Updates table to include PowerShell Core 6.1 and 6.2 because they are affected by CVE-2019-0820. See https://github.com/PowerShell/Announcements/issues/15 for more information.
1.0
May 14, 2019
Information published.
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