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Fencer Vulns
high 7.5

CVE-2020-1161 json

ASP.NET Core Denial of Service Vulnerability

published 2020-05-21 6 y ago modified 2026-09-08 2 mo ago also BIT-aspnet-core-2020-1161 , EUVD-2022-2160 , GHSA-3cf7-7wq6-8842

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.3%
EPSS 5.3% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

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.

Patch / fix

  • nuget Microsoft.AspNetCore.App.Runtime.linux-arm 3.1.4
  • nuget Microsoft.AspNetCore.App.Runtime.linux-arm64 3.1.4
  • nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 3.1.4
  • nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64 3.1.4
  • nuget Microsoft.AspNetCore.App.Runtime.linux-x64 3.1.4
  • nuget Microsoft.AspNetCore.App.Runtime.osx-x64 3.1.4
  • nuget Microsoft.AspNetCore.App.Runtime.win-arm 3.1.4
  • nuget Microsoft.AspNetCore.App.Runtime.win-x64 3.1.4
  • nuget Microsoft.AspNetCore.App.Runtime.win-x86 3.1.4
  • bitnami aspnet-core 3.1.1
  • dotnet3.1 RHEL 8 3.1.104-2.el8_2
  • dotnet RHEL 8 3.1.104-2.el8_2
  • dotnet-host RHEL 8 3.1.4-2.el8_2
  • dotnet-sdk-3.1 RHEL 8 3.1.104-2.el8_2
  • dotnet-hostfxr-3.1 RHEL 8 3.1.4-2.el8_2
  • dotnet-runtime-3.1 RHEL 8 3.1.4-2.el8_2
  • dotnet-templates-3.1 RHEL 8 3.1.104-2.el8_2
  • aspnetcore-runtime-3.1 RHEL 8 3.1.4-2.el8_2

red hat advisories RHSA-2020:2250RHSA-2020:2249

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-2020-1161 updated cvss 7.5

dotnet: Denial of service due to infinite loop

  • Red Hat .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet31-dotnet 3.1.104-2.el7, rh-dotnet31-dotnet-host 3.1.4-2.el7, rh-dotnet31-dotnet-sdk-3.1 3.1.104-2.el7, rh-dotnet31-dotnet-hostfxr-3.1 3.1.4-2.el7, rh-dotnet31-dotnet-runtime-3.1 3.1.4-2.el7, rh-dotnet31-aspnetcore-runtime-3.1 3.1.4-2.el7, +5 more Red Hat .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet31-dotnet 3.1.104-2.el7, rh-dotnet31-dotnet-host 3.1.4-2.el7, rh-dotnet31-dotnet-sdk-3.1 3.1.104-2.el7, rh-dotnet31-dotnet-hostfxr-3.1 3.1.4-2.el7, rh-dotnet31-dotnet-runtime-3.1 3.1.4-2.el7, rh-dotnet31-aspnetcore-runtime-3.1 3.1.4-2.el7, +5 more Red Hat .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet31-dotnet 3.1.104-2.el7, rh-dotnet31-dotnet-host 3.1.4-2.el7, rh-dotnet31-dotnet-sdk-3.1 3.1.104-2.el7, rh-dotnet31-dotnet-hostfxr-3.1 3.1.4-2.el7, rh-dotnet31-dotnet-runtime-3.1 3.1.4-2.el7, rh-dotnet31-aspnetcore-runtime-3.1 3.1.4-2.el7, +5 more
    fixed: vendor fix RHSA-2020:2249
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet 3.1.104-2.el8_2, dotnet-host 3.1.4-2.el8_2, dotnet3.1 3.1.104-2.el8_2, dotnet-sdk-3.1 3.1.104-2.el8_2, dotnet-hostfxr-3.1 3.1.4-2.el8_2, dotnet-runtime-3.1 3.1.4-2.el8_2, +6 more
    fixed: vendor fix RHSA-2020:2250
  • Red Hat .NET Core 2.1 on Red Hat Enterprise Linux rh-dotnet21, rh-dotnet21-runtime Red Hat Enterprise Linux 8 dotnet, dotnet3.0, dotnet-host, dotnet-sdk-2.1, dotnet-sdk-3.0, dotnet-hostfxr-3.0, +10 more
    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

5.31% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/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
OSV 3.1 7.5 CVSS:3.1/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.App.Runtime.linux-arm
>=3.1.0, <3.1.4
3.1.4
nuget Microsoft.AspNetCore.App.Runtime.linux-arm64
>=3.1.0, <3.1.4
3.1.4
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64
>=3.1.0, <3.1.4
3.1.4
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64
>=3.1.0, <3.1.4
3.1.4
nuget Microsoft.AspNetCore.App.Runtime.linux-x64
>=3.1.0, <3.1.4
3.1.4
nuget Microsoft.AspNetCore.App.Runtime.osx-x64
>=3.1.0, <3.1.4
3.1.4
nuget Microsoft.AspNetCore.App.Runtime.win-arm
>=3.1.0, <3.1.4
3.1.4
nuget Microsoft.AspNetCore.App.Runtime.win-x64
>=3.1.0, <3.1.4
3.1.4
nuget Microsoft.AspNetCore.App.Runtime.win-x86
>=3.1.0, <3.1.4
3.1.4
bitnami aspnet-core
>=3.1.0, <3.1.1
3.1.1

Affected products

  • Microsoft ASP.NET Core 3.1
  • Microsoft Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)
  • Microsoft Microsoft Visual Studio 2019 version 16.0
  • Microsoft Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)
  • Microsoft Microsoft Visual Studio 2019 version 16.5

Classification

Weakness
  • CWE-20 Improper Input Validation

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.