CVE-2019-0564 Denial of service in ASP.NET Core
Attackers can cause a denial of service in ASP.NET Core by sending improperly handled web requests, affecting service availability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-0564?
CVE-2019-0564 is a high-severity denial of service vulnerability in Microsoft ASP.NET Core, published on 8 Jan 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A denial of service vulnerability exists when ASP.NET Core improperly handles web requests, aka "ASP.NET Core Denial of Service Vulnerability." This affects ASP.NET Core 2.1. This CVE ID is unique from CVE-2019-0548.
Weakness: CWE-19
Which versions are affected by CVE-2019-0564?
20 open source packages ship an affected version, including Microsoft.AspNetCore.All, Microsoft.AspNetCore.App and Microsoft.AspNetCore.Server.Kestrel.Core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.AspNetCore.All NuGet | From 2.1.0 | 2.1.7 |
Microsoft.AspNetCore.All NuGet | From 2.1.0 | 2.1.7 |
Microsoft.AspNetCore.All NuGet | From 2.2.0 | 2.2.1 |
Microsoft.AspNetCore.All NuGet | From 2.2.0 | 2.2.1 |
Microsoft.AspNetCore.App NuGet | From 2.1.0 | 2.1.7 |
Microsoft.AspNetCore.App NuGet | From 2.1.0 | 2.1.7 |
14 more packages
Microsoft.AspNetCore.App NuGet | From 2.2.0 | 2.2.1 |
Microsoft.AspNetCore.App NuGet | From 2.2.0 | 2.2.1 |
Microsoft.AspNetCore.Server.Kestrel.Core NuGet | From 2.1.0 | 2.1.7 |
Microsoft.AspNetCore.Server.Kestrel.Core NuGet | From 2.1.0 | 2.1.7 |
Microsoft.AspNetCore.WebSockets NuGet | From 2.1.0 | 2.1.7 |
Microsoft.AspNetCore.WebSockets NuGet | From 2.1.0 | 2.1.7 |
Microsoft.AspNetCore.WebSockets NuGet | From 2.2.0 | 2.2.1 |
Microsoft.AspNetCore.WebSockets NuGet | From 2.2.0 | 2.2.1 |
Microsoft.NETCore.App NuGet | From 2.1.0 | 2.1.7 |
Microsoft.NETCore.App NuGet | From 2.1.0 | 2.1.7 |
Microsoft.NETCore.App NuGet | From 2.2.0 | 2.2.1 |
Microsoft.NETCore.App NuGet | From 2.2.0 | 2.2.1 |
System.Net.WebSockets.WebSocketProtocol NuGet | From 4.5.0 | 4.5.3 |
System.Net.WebSockets.WebSocketProtocol NuGet | From 4.5.0 | 4.5.3 |
Products include Microsoft Asp.net Core.
How do I fix CVE-2019-0564?
Upgrade Microsoft.AspNetCore.All to a fixed version for your release line: 2.1.7 or 2.2.1.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-0564 being exploited?
There is no known exploitation of CVE-2019-0564 in the wild and no public exploit code.
Other vulnerabilities in Microsoft ASP.NET Core
- CVE-2025-55315 ASP.NET Security Feature Bypass Vulnerability
- CVE-2026-88092 ASP.NET Core Tampering Vulnerability
- CVE-2026-40372 ASP.NET Core Elevation of Privilege Vulnerability
- CVE-2021-43877 ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability
- CVE-2020-0603 Remote code execution in ASP.NET Core
Sources
Also known as GHSA-6px8-22w5-w334.