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Fencer Vulns
high 7.5

CVE-2024-21386 json

.NET Denial of Service Vulnerability

published 2024-02-13 2 y ago modified 2026-09-08 2 mo ago also BIT-aspnet-core-2024-21386 , EUVD-2024-0637 , GHSA-g74q-5xw3-j7q9

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

.NET Denial of Service Vulnerability

Patch / fix

  • nuget Microsoft.AspNetCore.App.Runtime.linux-arm 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-arm64 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-x64 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.osx-arm64 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.osx-x64 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.win-arm 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.win-arm64 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.win-x64 6.0.27, 7.0.16, 8.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.win-x86 6.0.27, 7.0.16, 8.0.2
  • bitnami aspnet-core 6.0.27, 7.0.16, 8.0.2
  • Microsoft ASP.NET Core 6.0 6.0.27
  • Microsoft ASP.NET Core 7.0 7.0.16
  • Microsoft ASP.NET Core 8.0 8.0.2
  • Microsoft Microsoft Visual Studio 2022 version 17.4 17.4.16
  • Microsoft Microsoft Visual Studio 2022 version 17.6 17.6.12
  • Microsoft Microsoft Visual Studio 2022 version 17.8 17.8.7
  • dotnet6 Ubuntu 22.04 LTS 6.0.127-0ubuntu1~22.04.1
  • dotnet7 Ubuntu 22.04 LTS 7.0.116-0ubuntu1~22.04.1
  • dotnet8 Ubuntu 22.04 LTS 8.0.102-8.0.2-0ubuntu1~22.04.1

ubuntu advisories UBUNTU-CVE-2024-21386

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dotnet7.0 RHEL 8 7.0.119-1.el8_10
  • dotnet-sdk-7.0 RHEL 8 7.0.119-1.el8_10
  • dotnet-hostfxr-7.0 RHEL 8 7.0.19-1.el8_10
  • dotnet-runtime-7.0 RHEL 8 7.0.19-1.el8_10
  • dotnet-templates-7.0 RHEL 8 7.0.119-1.el8_10
  • aspnetcore-runtime-7.0 RHEL 8 7.0.19-1.el8_10
  • dotnet-apphost-pack-7.0 RHEL 8 7.0.19-1.el8_10
  • dotnet-targeting-pack-7.0 RHEL 8 7.0.19-1.el8_10

red hat advisories RHSA-2024:3340RHSA-2024:2843RHSA-2024:0848RHSA-2024:0827RHSA-2024:0814RHSA-2024:0806

  • dotnet-sdk-7.0 AlmaLinux 8 7.0.119-1.el8_10
  • dotnet-hostfxr-7.0 AlmaLinux 8 7.0.19-1.el8_10
  • dotnet-runtime-7.0 AlmaLinux 8 7.0.19-1.el8_10
  • dotnet-templates-7.0 AlmaLinux 8 7.0.119-1.el8_10
  • aspnetcore-runtime-7.0 AlmaLinux 8 7.0.19-1.el8_10
  • dotnet-apphost-pack-7.0 AlmaLinux 8 7.0.19-1.el8_10
  • dotnet-targeting-pack-7.0 AlmaLinux 8 7.0.19-1.el8_10
  • aspnetcore-targeting-pack-7.0 AlmaLinux 8 7.0.19-1.el8_10

almalinux advisories ALSA-2024:3340ALSA-2024:2843ALSA-2024:0827ALSA-2024:0848ALSA-2024:0805ALSA-2024:0806

  • dotnet7.0 Rocky Linux 9 7.0.119-1.el9_4
  • dotnet7.0 Rocky Linux 8 7.0.116-1.el8_9
  • dotnet8.0 Rocky Linux 8 8.0.102-2.el8_9

rocky linux advisories RLSA-2024:2843RLSA-2024:0806RLSA-2024:0827

  • dotnet6-build Alpine 3.20, Alpine 3.19 6.0.127-r0
  • dotnet7-build Alpine 3.19 7.0.116-r0
  • dotnet6-runtime Alpine 3.20, Alpine 3.19 6.0.27-r0
  • dotnet7-runtime Alpine 3.19 7.0.16-r0
  • dotnet8-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 8.0.2-r0

alpine advisories ALPINE-CVE-2024-21386

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2024-21386 updated cvss 7.5

dotnet: Denial of Service in SignalR server

  • Red Hat .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet60-dotnet 6.0.127-1.el7_9, rh-dotnet60-dotnet-host 6.0.27-1.el7_9, rh-dotnet60-dotnet-sdk-6.0 6.0.127-1.el7_9, rh-dotnet60-dotnet-hostfxr-6.0 6.0.27-1.el7_9, rh-dotnet60-dotnet-runtime-6.0 6.0.27-1.el7_9, rh-dotnet60-dotnet-templates-6.0 6.0.127-1.el7_9, +6 more Red Hat .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet60-dotnet 6.0.127-1.el7_9, rh-dotnet60-dotnet-host 6.0.27-1.el7_9, rh-dotnet60-dotnet-sdk-6.0 6.0.127-1.el7_9, rh-dotnet60-dotnet-hostfxr-6.0 6.0.27-1.el7_9, rh-dotnet60-dotnet-runtime-6.0 6.0.27-1.el7_9, rh-dotnet60-dotnet-templates-6.0 6.0.127-1.el7_9, +6 more Red Hat .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet60-dotnet 6.0.127-1.el7_9, rh-dotnet60-dotnet-host 6.0.27-1.el7_9, rh-dotnet60-dotnet-sdk-6.0 6.0.127-1.el7_9, rh-dotnet60-dotnet-hostfxr-6.0 6.0.27-1.el7_9, rh-dotnet60-dotnet-runtime-6.0 6.0.27-1.el7_9, rh-dotnet60-dotnet-templates-6.0 6.0.127-1.el7_9, +6 more
    fixed: vendor fix RHSA-2024:0814
  • Red Hat CodeReady Linux Builder (v. 8) dotnet-sdk-6.0-source-built-artifacts 6.0.127-1.el8_9, dotnet-sdk-7.0-source-built-artifacts 7.0.116-1.el8_9, dotnet-sdk-8.0-source-built-artifacts 8.0.102-2.el8_9
    fixed: vendor fix RHSA-2024:0808
  • Red Hat CodeReady Linux Builder (v. 9) dotnet-sdk-6.0-source-built-artifacts 6.0.127-1.el9_3, dotnet-sdk-7.0-source-built-artifacts 7.0.116-1.el9_3, dotnet-sdk-8.0-source-built-artifacts 8.0.102-2.el9_3
    fixed: vendor fix RHSA-2024:0807
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet 8.0.102-2.el8_9, dotnet-host 8.0.2-2.el8_9, dotnet6.0 6.0.127-1.el8_9, dotnet7.0 7.0.116-1.el8_9, dotnet8.0 8.0.102-2.el8_9, dotnet7.0 7.0.119-1.el8_10, +36 more
    fixed: vendor fix RHSA-2024:3340
  • Red Hat Enterprise Linux AppStream (v. 9) dotnet-host 8.0.2-2.el9_3, dotnet6.0 6.0.127-1.el9_3, dotnet7.0 7.0.116-1.el9_3, dotnet7.0 7.0.119-1.el9_4, dotnet8.0 8.0.102-2.el9_3, dotnet-sdk-6.0 6.0.127-1.el9_3, +35 more
    fixed: vendor fix RHSA-2024:0807
  • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-7.0-source-built-artifacts 7.0.119-1.el8_10
    fixed: vendor fix RHSA-2024:3340
  • Red Hat Enterprise Linux CRB (v. 9) dotnet-sdk-7.0-source-built-artifacts 7.0.119-1.el9_4
    fixed: vendor fix RHSA-2024:2843

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

2.42% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-arm64
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-x64
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.osx-arm64
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.osx-x64
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-arm
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-arm64
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-x64
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-x86
<6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2
bitnami aspnet-core
>=6.0.0, <6.0.27
>=7.0.0, <7.0.16
>=8.0.0, <8.0.2
6.0.27
7.0.16
8.0.2

Affected products

  • Microsoft ASP.NET Core 6.0
  • Microsoft ASP.NET Core 7.0
  • Microsoft ASP.NET Core 8.0
  • Microsoft Microsoft Visual Studio 2022 version 17.4
  • Microsoft Microsoft Visual Studio 2022 version 17.6
  • Microsoft Microsoft Visual Studio 2022 version 17.8

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

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.