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Fencer Intel
high 8.8

CVE-2020-0603 in the critical feed json

Remote code execution in ASP.NET Core

published 6y ago modified 2mo ago also BIT-aspnet-core-2020-0603 , EUVD-2022-2713 , GHSA-655q-9gvg-q4cm

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
22.6%
EPSS 22.6% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

A remote code execution vulnerability exists in ASP.NET Core software when the software fails to handle objects in memory.An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user, aka 'ASP.NET Core Remote Code Execution Vulnerability'.

Patch / fix

  • nuget Microsoft.AspNetCore.All 2.1.15
  • nuget Microsoft.AspNetCore.App 2.1.15, 3.0.1, 3.1.1
  • nuget Microsoft.AspNetCore.Http.Connections 1.0.15
  • nuget Microsoft.AspNetCore.App.Runtime.linux-arm 3.1.1
  • nuget Microsoft.AspNetCore.App.Runtime.linux-arm64 3.1.1
  • nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 3.1.1
  • nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64 3.1.1
  • nuget Microsoft.AspNetCore.App.Runtime.linux-x64 3.1.1
  • nuget Microsoft.AspNetCore.App.Runtime.osx-x64 3.1.1
  • nuget Microsoft.AspNetCore.App.Runtime.win-arm 3.1.1
  • nuget Microsoft.AspNetCore.App.Runtime.win-x64 3.1.1
  • nuget Microsoft.AspNetCore.App.Runtime.win-x86 3.1.1
  • bitnami aspnet-core 2.1.1, 3.0.1, 3.1.1
  • rh-dotnet30-dotnet RHEL 3.0 DOTNET 3.0.102-3.el7
  • rh-dotnet31-dotnet RHEL 3.1 DOTNET 3.1.101-4.el7
  • rh-dotnet30-dotnet-host RHEL 3.0 DOTNET 3.0.2-3.el7
  • rh-dotnet31-dotnet-host RHEL 3.1 DOTNET 3.1.1-4.el7
  • rh-dotnet30-dotnet-sdk-3.0 RHEL 3.0 DOTNET 3.0.102-3.el7
  • rh-dotnet31-dotnet-sdk-3.1 RHEL 3.1 DOTNET 3.1.101-4.el7
  • rh-dotnet30-dotnet-hostfxr-3.0 RHEL 3.0 DOTNET 3.0.2-3.el7
  • rh-dotnet30-dotnet-runtime-3.0 RHEL 3.0 DOTNET 3.0.2-3.el7

red hat advisories RHSA-2020:0134RHSA-2020:0130

Is CVE-2020-0603 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2020-0603 updated cvss 8.1

dotnet: Memory Corruption in SignalR

  • Red Hat .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet30-dotnet 3.0.102-3.el7, rh-dotnet31-dotnet 3.1.101-4.el7, rh-dotnet30-dotnet-host 3.0.2-3.el7, rh-dotnet31-dotnet-host 3.1.1-4.el7, rh-dotnet30-dotnet-sdk-3.0 3.0.102-3.el7, rh-dotnet31-dotnet-sdk-3.1 3.1.101-4.el7, +16 more Red Hat .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet30-dotnet 3.0.102-3.el7, rh-dotnet31-dotnet 3.1.101-4.el7, rh-dotnet30-dotnet-host 3.0.2-3.el7, rh-dotnet31-dotnet-host 3.1.1-4.el7, rh-dotnet30-dotnet-sdk-3.0 3.0.102-3.el7, rh-dotnet31-dotnet-sdk-3.1 3.1.101-4.el7, +16 more Red Hat .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet30-dotnet 3.0.102-3.el7, rh-dotnet31-dotnet 3.1.101-4.el7, rh-dotnet30-dotnet-host 3.0.2-3.el7, rh-dotnet31-dotnet-host 3.1.1-4.el7, rh-dotnet30-dotnet-sdk-3.0 3.0.102-3.el7, rh-dotnet31-dotnet-sdk-3.1 3.1.101-4.el7, +16 more
    fixed: vendor fix RHSA-2020:0134
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet 3.0.102-2.el8_1, dotnet-host 3.0.2-2.el8_1, dotnet3.0 3.0.102-2.el8_1, dotnet-sdk-3.0 3.0.102-2.el8_1, dotnet-hostfxr-3.0 3.0.2-2.el8_1, dotnet-runtime-3.0 3.0.2-2.el8_1, +6 more
    fixed: vendor fix RHSA-2020:0130
  • Red Hat .NET Core 2.1 on Red Hat Enterprise Linux rh-dotnet21, rh-dotnet21-runtime Red Hat .NET Core 2.2 on Red Hat Enterprise Linux rh-dotnet22, rh-dotnet22-runtime Red Hat Enterprise Linux 8 dotnet, dotnet3.1, dotnet-host, dotnet-sdk-2.1, dotnet-sdk-3.1, dotnet-hostfxr-3.1, +11 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

22.56% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C
OSV 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
nuget Microsoft.AspNetCore.All
>=2.1.0, <2.1.15
2.1.15
nuget Microsoft.AspNetCore.App
>=3.1.0, <3.1.1
>=3.0.0, <3.0.1
>=2.1.0, <2.1.15
3.1.1
3.0.1
2.1.15
nuget Microsoft.AspNetCore.Http.Connections
>=1.0.0, <1.0.15
1.0.15
nuget Microsoft.AspNetCore.App.Runtime.linux-arm
>=3.1.0, <3.1.1
3.1.1
nuget Microsoft.AspNetCore.App.Runtime.linux-arm64
>=3.1.0, <3.1.1
3.1.1
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64
>=3.1.0, <3.1.1
3.1.1
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64
>=3.1.0, <3.1.1
3.1.1
nuget Microsoft.AspNetCore.App.Runtime.linux-x64
>=3.1.0, <3.1.1
3.1.1
nuget Microsoft.AspNetCore.App.Runtime.osx-x64
>=3.1.0, <3.1.1
3.1.1
nuget Microsoft.AspNetCore.App.Runtime.win-arm
>=3.1.0, <3.1.1
3.1.1
nuget Microsoft.AspNetCore.App.Runtime.win-x64
>=3.1.0, <3.1.1
3.1.1
nuget Microsoft.AspNetCore.App.Runtime.win-x86
>=3.1.0, <3.1.1
3.1.1
bitnami aspnet-core
>=2.1.0, <2.1.1
>=3.0.0, <3.0.1
>=3.1.0, <3.1.1
2.1.1
3.0.1
3.1.1

Affected products

  • Microsoft ASP.NET Core

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-787 Out-of-bounds Write

References

Sources

Fencer Intel 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.