TI-2020-01126 Aliases CVE-2020-1161 GHSA-3cf7-7wq6-8842

ASP.NET Core Denial of Service Vulnerability

MEDIUM 41CWE-20Published 2020-05-21 · Updated 2026-08-19

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 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

A denial of service vulnerability exists when ASP.NET Core improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against an ASP.NET Core web application. The vulnerability can be exploited remotely, without authentication. A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the ASP.NET Core application. The update addresses the vulnerability by correcting how the ASP.NET Core web application handles web requests.

Why it matters now

EPSS 0.05313 92nd percentileScored 2026-11-07

Fix Fixed ASP.NET Core 3.1 (Microsoft): publicationMicrosoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) (Microsoft): publication+12 more productsRed Hat: 2 advisories

SSVC decision points

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Microsoft	ASP.NET Core 3.1	3.0 to before publication	publication	Patch available	CNA
Microsoft	Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)	15.9.0 to before publication	publication	Patch available	CNA
Microsoft	Microsoft Visual Studio 2019 version 16.0	16.0 to before publication	publication	Patch available	CNA
Microsoft	Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)	16.0 to before publication	publication	Patch available	CNA
Microsoft	Microsoft Visual Studio 2019 version 16.5	16.0 to before publication	publication	Patch available	CNA
—	Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet)	3.1.0 to before 3.1.4	3.1.4	Patch available	GHSA-3cf7-7wq6-8842
—	Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet)	3.1.0 to before 3.1.4	3.1.4	Patch available	GHSA-3cf7-7wq6-8842
—	Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet)	3.1.0 to before 3.1.4	3.1.4	Patch available	GHSA-3cf7-7wq6-8842
—	Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet)	3.1.0 to before 3.1.4	3.1.4	Patch available	GHSA-3cf7-7wq6-8842
—	Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet)	3.1.0 to before 3.1.4	3.1.4	Patch available	GHSA-3cf7-7wq6-8842
—	Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet)	3.1.0 to before 3.1.4	3.1.4	Patch available	GHSA-3cf7-7wq6-8842
—	Microsoft.AspNetCore.App.Runtime.win-arm (NuGet)	3.1.0 to before 3.1.4	3.1.4	Patch available	GHSA-3cf7-7wq6-8842
—	Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet)	3.1.0 to before 3.1.4	3.1.4	Patch available	GHSA-3cf7-7wq6-8842
—	Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet)	3.1.0 to before 3.1.4	3.1.4	Patch available	GHSA-3cf7-7wq6-8842

ASP.NET Core 3.1 VendorMicrosoft Affected 3.0 to before publication Fixed in publication Patch available CNA
Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) VendorMicrosoft Affected 15.9.0 to before publication Fixed in publication Patch available CNA
Microsoft Visual Studio 2019 version 16.0 VendorMicrosoft Affected 16.0 to before publication Fixed in publication Patch available CNA
Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) VendorMicrosoft Affected 16.0 to before publication Fixed in publication Patch available CNA
Microsoft Visual Studio 2019 version 16.5 VendorMicrosoft Affected 16.0 to before publication Fixed in publication Patch available CNA
Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) Vendor— Affected 3.1.0 to before 3.1.4 Fixed in 3.1.4 Patch available GHSA-3cf7-7wq6-8842
Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) Vendor— Affected 3.1.0 to before 3.1.4 Fixed in 3.1.4 Patch available GHSA-3cf7-7wq6-8842
Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet) Vendor— Affected 3.1.0 to before 3.1.4 Fixed in 3.1.4 Patch available GHSA-3cf7-7wq6-8842
Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet) Vendor— Affected 3.1.0 to before 3.1.4 Fixed in 3.1.4 Patch available GHSA-3cf7-7wq6-8842
Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet) Vendor— Affected 3.1.0 to before 3.1.4 Fixed in 3.1.4 Patch available GHSA-3cf7-7wq6-8842
Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet) Vendor— Affected 3.1.0 to before 3.1.4 Fixed in 3.1.4 Patch available GHSA-3cf7-7wq6-8842
Microsoft.AspNetCore.App.Runtime.win-arm (NuGet) Vendor— Affected 3.1.0 to before 3.1.4 Fixed in 3.1.4 Patch available GHSA-3cf7-7wq6-8842
Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet) Vendor— Affected 3.1.0 to before 3.1.4 Fixed in 3.1.4 Patch available GHSA-3cf7-7wq6-8842
Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet) Vendor— Affected 3.1.0 to before 3.1.4 Fixed in 3.1.4 Patch available GHSA-3cf7-7wq6-8842

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:a:microsoft:asp.net_core:3.1:::::::*	3.1	Vulnerable	Microsoft
cpe:2.3:a:microsoft:visual_studio_2017::::::::	15.1 – 15.9	Vulnerable	Microsoft
cpe:2.3:a:microsoft:visual_studio_2019::::::::	16.0 – 16.5	Vulnerable	Microsoft

cpe:2.3:a:microsoft:asp.net_core:3.1:*:*:*:*:*:*:* Versions 3.1 Vulnerable ·Microsoft
cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:* Versions 15.1 – 15.9 Vulnerable ·Microsoft
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:* Versions 16.0 – 16.5 Vulnerable ·Microsoft

Remediation

Fix · CNA ASP.NET Core 3.1 (Microsoft) Fixed in publication
Fix · CNA Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) (Microsoft) Fixed in publication
Fix · CNA Microsoft Visual Studio 2019 version 16.0 (Microsoft) Fixed in publication
Fix · CNA Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) (Microsoft) Fixed in publication
Fix · CNA Microsoft Visual Studio 2019 version 16.5 (Microsoft) Fixed in publication
Fix · GHSA-3cf7-7wq6-8842 Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) Fixed in 3.1.4 Advisory →
Fix · GHSA-3cf7-7wq6-8842 Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) Fixed in 3.1.4 Advisory →
Fix · GHSA-3cf7-7wq6-8842 Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet) Fixed in 3.1.4 Advisory →
Fix · GHSA-3cf7-7wq6-8842 Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet) Fixed in 3.1.4 Advisory →
Fix · GHSA-3cf7-7wq6-8842 Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet) Fixed in 3.1.4 Advisory →
Fix · GHSA-3cf7-7wq6-8842 Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet) Fixed in 3.1.4 Advisory →
Fix · GHSA-3cf7-7wq6-8842 Microsoft.AspNetCore.App.Runtime.win-arm (NuGet) Fixed in 3.1.4 Advisory →
Fix · GHSA-3cf7-7wq6-8842 Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet) Fixed in 3.1.4 Advisory →
Fix · GHSA-3cf7-7wq6-8842 Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet) Fixed in 3.1.4 Advisory →

Red Hat 2 advisories

RHSA-2020:2250 Released 2020-05-21 · Red Hat rating Important
dotnet3.1 security update
- Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-3.1-3.1.4-2.el8_2, aspnetcore-targeting-pack-3.1-3.1.4-2.el8_2, dotnet-3.1.104-2.el8_2 +9
RHSA-2020:2249 Released 2020-05-21 · Red Hat rating Important
.NET Core on Red Hat Enterprise Linux security and bug fix update
- .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet31-aspnetcore-runtime-3.1-3.1.4-2.el7, rh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.4-2.el7, rh-dotnet31-dotnet-3.1.104-2.el7 +8
- .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet31-aspnetcore-runtime-3.1-3.1.4-2.el7, rh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.4-2.el7, rh-dotnet31-dotnet-3.1.104-2.el7 +8
- .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet31-aspnetcore-runtime-3.1-3.1.4-2.el7, rh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.4-2.el7, rh-dotnet31-dotnet-3.1.104-2.el7 +8

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7)	Fixed	RHSA-2020:2249
.NET Core on Red Hat Enterprise Linux Server (v. 7)	Fixed	RHSA-2020:2249
.NET Core on Red Hat Enterprise Linux Workstation (v. 7)	Fixed	RHSA-2020:2249
Red Hat Enterprise Linux AppStream (v. 8)	Fixed	RHSA-2020:2250

Not affected: 2 products

.NET Core 2.1 on Red Hat Enterprise Linux
Red Hat Enterprise Linux 8

Timeline

2026-10-02 Threatist record created from CVE-2020-1161
2026-10-03 Alias added: GHSA-3cf7-7wq6-8842

References

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2020-1161

Other 1

https://github.com/aspnet/Announcements/issues/416

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