Skip to content
Fencer Vulns
high 7.5

CVE-2019-0564 json

Denial of service in ASP.NET Core

published 2019-01-08 7 y ago modified 2026-06-17 4 mo ago also GHSA-6px8-22w5-w334 , EUVD-2022-2841

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.4%
EPSS 8.4% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

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.

Patch / fix

  • nuget Microsoft.AspNetCore.WebSockets 2.1.7, 2.2.1
  • nuget Microsoft.AspNetCore.Server.Kestrel.Core 2.1.7
  • nuget System.Net.WebSockets.WebSocketProtocol 4.5.3
  • nuget Microsoft.NETCore.App 2.1.7, 2.2.1
  • nuget Microsoft.AspNetCore.App 2.1.7, 2.2.1
  • nuget Microsoft.AspNetCore.All 2.1.7, 2.2.1
  • rh-dotnet21 RHEL 2.1 DOTNET 2.1-6.el7
  • rh-dotnet22 RHEL 2.2 DOTNET 2.2-2.el7
  • rh-dotnet21-dotnet RHEL 2.1 DOTNET 2.1.503-1.el7
  • rh-dotnet22-dotnet RHEL 2.2 DOTNET 2.2.102-1.el7
  • rh-dotnet21-runtime RHEL 2.1 DOTNET 2.1-6.el7
  • rh-dotnet22-runtime RHEL 2.2 DOTNET 2.2-2.el7
  • rh-dotnet21-dotnet-host RHEL 2.1 DOTNET 2.1.7-1.el7
  • rh-dotnet22-dotnet-host RHEL 2.2 DOTNET 2.2.1-1.el7

red hat advisories RHSA-2019:0040

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-0564 updated cvss 5.9

Core: Kestrel - WebSocket DoS via CancellationToken (CoreFX and ASP.NET)

  • Red Hat .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet21 2.1-6.el7, rh-dotnet22 2.2-2.el7, rh-dotnet21-runtime 2.1-6.el7, rh-dotnet22-runtime 2.2-2.el7, rh-dotnet21-dotnet 2.1.503-1.el7, rh-dotnet22-dotnet 2.2.102-1.el7, +9 more Red Hat .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet21 2.1-6.el7, rh-dotnet22 2.2-2.el7, rh-dotnet21-runtime 2.1-6.el7, rh-dotnet22-runtime 2.2-2.el7, rh-dotnet21-dotnet 2.1.503-1.el7, rh-dotnet22-dotnet 2.2.102-1.el7, +9 more Red Hat .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet21 2.1-6.el7, rh-dotnet22 2.2-2.el7, rh-dotnet21-runtime 2.1-6.el7, rh-dotnet22-runtime 2.2-2.el7, rh-dotnet21-dotnet 2.1.503-1.el7, rh-dotnet22-dotnet 2.2.102-1.el7, +9 more
    fixed: vendor fix RHSA-2019:0040
  • Red Hat .NET Core 1.0 on Red Hat Enterprise Linux rh-dotnetcore10-dotnetcore Red Hat .NET Core 1.1 on Red Hat Enterprise Linux rh-dotnetcore11-dotnetcore Red Hat Enterprise Linux 8 dotnet, dotnet-host, dotnet-sdk-2.1, dotnet-runtime-2.1, dotnet-sdk-2.1.5xx, dotnet-host-fxr-2.1
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

8.39% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
nuget Microsoft.AspNetCore.WebSockets
>=2.2.0, <2.2.1
>=2.1.0, <2.1.7
2.2.1
2.1.7
nuget Microsoft.AspNetCore.Server.Kestrel.Core
>=2.1.0, <2.1.7
2.1.7
nuget System.Net.WebSockets.WebSocketProtocol
>=4.5.0, <4.5.3
4.5.3
nuget Microsoft.NETCore.App
>=2.2.0, <2.2.1
>=2.1.0, <2.1.7
2.2.1
2.1.7
nuget Microsoft.AspNetCore.App
>=2.2.0, <2.2.1
>=2.1.0, <2.1.7
2.2.1
2.1.7
nuget Microsoft.AspNetCore.All
>=2.2.0, <2.2.1
>=2.1.0, <2.1.7
2.2.1
2.1.7

Affected products

  • Microsoft ASP.NET Core

Classification

Weakness
  • CWE-19 Data Processing Errors

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.