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.

An update of the dotnet package has been released.

The Microsoft ASP.NET Core installation on the remote host is version 2.1.x < 2.1.7, 2.2.x < 2.2.1. It is, therefore, affected by a denial of service (DoS) vulnerability when ASP.NET Core improperly handles web requests. An unauthenticated, remote attacker could exploit this issue, via sending a specially crafted requests to the .NET Core application, to cause the application to stop responding.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:0040 advisory.

    .NET Core is a managed software framework. It implements a subset of the .NET framework APIs and several     new APIs, and it includes a CLR implementation.

    New versions of .NET Core that address security vulnerabilities are now     available. The updated versions are .NET Core 2.1.5 and 2.2.1.

    Security Fix(es):

    * .NET Core: NCL - SocketsHttpHandler mishandling 1xx response as a final response leads to info     disclosure (CVE-2019-0545)

    * .NET Core: ANCM WebSocket DOS (CVE-2019-0548)

    * .NET Core: Kestrel - WebSocket DoS via CancellationToken (CoreFX and ASP.NET) (CVE-2019-0564)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

    For more information, please refer to the upstream docs in the References     section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
237067	Photon OS 4.0: Dotnet PHSA-2025-4.0-0804	Nessus	PhotonOS Local Security Checks	high
123131	Security Update for Microsoft ASP.NET Core (DoS) (January 2019)	Nessus	Windows	high
121143	RHEL 7 : .NET Core on Red Hat Enterprise Linux (RHSA-2019:0040)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2019-0564

high

Tenable Plugins

high

high

high