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TI-2019-00356 Aliases CVE-2019-0564GHSA-6px8-22w5-w334

A denial of service vulnerability exists when ASP.NET Core improperly handles web…

Priority MEDIUM 44CWE-19Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA, GitHub and Red Hat.

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.

Why it matters now

EPSS 0.08386 95th percentileScored 2026-11-07
Fix Fixed Microsoft.AspNetCore.WebSockets (NuGet): 2.2.1, 2.1.7Microsoft.AspNetCore.Server.Kestrel.Core (NuGet): 2.1.7+4 more productsRed Hat: 1 advisory

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftASP.NET Core2.1—No fix listedCNA
—Microsoft.AspNetCore.WebSockets (NuGet)2.2.0 to before 2.2.12.2.1Patch availableGHSA-6px8-22w5-w334
—Microsoft.AspNetCore.WebSockets (NuGet)2.1.0 to before 2.1.72.1.7Patch availableGHSA-6px8-22w5-w334
—Microsoft.AspNetCore.Server.Kestrel.Core (NuGet)2.1.0 to before 2.1.72.1.7Patch availableGHSA-6px8-22w5-w334
—System.Net.WebSockets.WebSocketProtocol (NuGet)4.5.0 to before 4.5.34.5.3Patch availableGHSA-6px8-22w5-w334
—Microsoft.NETCore.App (NuGet)2.2.0 to before 2.2.12.2.1Patch availableGHSA-6px8-22w5-w334
—Microsoft.NETCore.App (NuGet)2.1.0 to before 2.1.72.1.7Patch availableGHSA-6px8-22w5-w334
—Microsoft.AspNetCore.App (NuGet)2.2.0 to before 2.2.12.2.1Patch availableGHSA-6px8-22w5-w334
—Microsoft.AspNetCore.App (NuGet)2.1.0 to before 2.1.72.1.7Patch availableGHSA-6px8-22w5-w334
—Microsoft.AspNetCore.All (NuGet)2.2.0 to before 2.2.12.2.1Patch availableGHSA-6px8-22w5-w334
—Microsoft.AspNetCore.All (NuGet)2.1.0 to before 2.1.72.1.7Patch availableGHSA-6px8-22w5-w334
  • ASP.NET Core VendorMicrosoft Affected 2.1 Fixed in — No fix listed CNA
  • Microsoft.AspNetCore.WebSockets (NuGet) Vendor— Affected 2.2.0 to before 2.2.1 Fixed in 2.2.1 Patch available GHSA-6px8-22w5-w334
  • Microsoft.AspNetCore.WebSockets (NuGet) Vendor— Affected 2.1.0 to before 2.1.7 Fixed in 2.1.7 Patch available GHSA-6px8-22w5-w334
  • Microsoft.AspNetCore.Server.Kestrel.Core (NuGet) Vendor— Affected 2.1.0 to before 2.1.7 Fixed in 2.1.7 Patch available GHSA-6px8-22w5-w334
  • System.Net.WebSockets.WebSocketProtocol (NuGet) Vendor— Affected 4.5.0 to before 4.5.3 Fixed in 4.5.3 Patch available GHSA-6px8-22w5-w334
  • Microsoft.NETCore.App (NuGet) Vendor— Affected 2.2.0 to before 2.2.1 Fixed in 2.2.1 Patch available GHSA-6px8-22w5-w334
  • Microsoft.NETCore.App (NuGet) Vendor— Affected 2.1.0 to before 2.1.7 Fixed in 2.1.7 Patch available GHSA-6px8-22w5-w334
  • Microsoft.AspNetCore.App (NuGet) Vendor— Affected 2.2.0 to before 2.2.1 Fixed in 2.2.1 Patch available GHSA-6px8-22w5-w334
  • Microsoft.AspNetCore.App (NuGet) Vendor— Affected 2.1.0 to before 2.1.7 Fixed in 2.1.7 Patch available GHSA-6px8-22w5-w334
  • Microsoft.AspNetCore.All (NuGet) Vendor— Affected 2.2.0 to before 2.2.1 Fixed in 2.2.1 Patch available GHSA-6px8-22w5-w334
  • Microsoft.AspNetCore.All (NuGet) Vendor— Affected 2.1.0 to before 2.1.7 Fixed in 2.1.7 Patch available GHSA-6px8-22w5-w334

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:asp.net_core:2.1:*:*:*:*:*:*:*2.1VulnerableMicrosoft
  • cpe:2.3:a:microsoft:asp.net_core:2.1:*:*:*:*:*:*:* Versions 2.1 Vulnerable ·Microsoft

Remediation

  • Fix · GHSA-6px8-22w5-w334 Microsoft.AspNetCore.WebSockets (NuGet) Fixed in 2.2.1 Advisory →
  • Fix · GHSA-6px8-22w5-w334 Microsoft.AspNetCore.WebSockets (NuGet) Fixed in 2.1.7 Advisory →
  • Fix · GHSA-6px8-22w5-w334 Microsoft.AspNetCore.Server.Kestrel.Core (NuGet) Fixed in 2.1.7 Advisory →
  • Fix · GHSA-6px8-22w5-w334 System.Net.WebSockets.WebSocketProtocol (NuGet) Fixed in 4.5.3 Advisory →
  • Fix · GHSA-6px8-22w5-w334 Microsoft.NETCore.App (NuGet) Fixed in 2.2.1 Advisory →
  • Fix · GHSA-6px8-22w5-w334 Microsoft.NETCore.App (NuGet) Fixed in 2.1.7 Advisory →
  • Fix · GHSA-6px8-22w5-w334 Microsoft.AspNetCore.App (NuGet) Fixed in 2.2.1 Advisory →
  • Fix · GHSA-6px8-22w5-w334 Microsoft.AspNetCore.App (NuGet) Fixed in 2.1.7 Advisory →
  • Fix · GHSA-6px8-22w5-w334 Microsoft.AspNetCore.All (NuGet) Fixed in 2.2.1 Advisory →
  • Fix · GHSA-6px8-22w5-w334 Microsoft.AspNetCore.All (NuGet) Fixed in 2.1.7 Advisory →

Red Hat 1 advisory

  • RHSA-2019:0040 Released 2019-01-09 · Red Hat rating Moderate
    .NET Core on Red Hat Enterprise Linux security update
    • .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet21-2.1-6.el7, rh-dotnet21-dotnet-2.1.503-1.el7, rh-dotnet21-dotnet-host-2.1.7-1.el7 +12
    • .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet21-2.1-6.el7, rh-dotnet21-dotnet-2.1.503-1.el7, rh-dotnet21-dotnet-host-2.1.7-1.el7 +12
    • .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet21-2.1-6.el7, rh-dotnet21-dotnet-2.1.503-1.el7, rh-dotnet21-dotnet-host-2.1.7-1.el7 +12

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Microsoft ASP.NET Core — RHSA-2019:0040

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2019-00341 A denial of service vulnerability exists when ASP.NET Core improperly handles web…Priority MEDIUM 44
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2019:0040
.NET Core on Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:0040
.NET Core on Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:0040
Not affected: 3 products
  • .NET Core 1.0 on Red Hat Enterprise Linux
  • .NET Core 1.1 on Red Hat Enterprise Linux
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-0564
  2. 2026-10-03 Alias added: GHSA-6px8-22w5-w334
  3. 2026-11-06 EPSS moved to the 95th–99th percentile

References

Patch 1

Advisory 2

Other 2

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-19596 .NET and Visual Studio Denial of Service Vulnerability KEVCVSS 3.1HIGH 7.5
  • TI-2025-34970 ASP.NET Security Feature Bypass Vulnerability CVSS 3.1CRITICAL 9.9
  • TI-2024-14164 .NET Denial of Service Vulnerability CVSS 3.1HIGH 7.5
  • TI-2023-18092 ASP.NET Core Denial of Service Vulnerability CVSS 3.1HIGH 8.2
  • TI-2023-18392 ASP.NET Core Security Feature Bypass Vulnerability CVSS 3.1MEDIUM 6.2
See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences