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Fencer Vulns
high 7.5

CVE-2022-21986 json

.NET Denial of Service Vulnerability

published 2022-02-09 4 y ago modified 2026-10-08 31 d ago also BIT-dotnet-2022-21986 , BIT-dotnet-sdk-2022-21986 , EUVD-2022-7179 , GHSA-x459-p2rx-f8ff

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

.NET Denial of Service Vulnerability

Patch / fix

  • nuget Microsoft.AspNetCore.App.Runtime.win-x64 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-x64 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.win-x86 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.osx-x64 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-arm64 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-arm 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.win-arm64 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.win-arm 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm 5.0.14, 6.0.2
  • nuget Microsoft.AspNetCore.App.Runtime.osx-arm64 6.0.2
  • bitnami dotnet 5.0.14, 6.0.2
  • bitnami dotnet-sdk 5.0.14, 6.0.2
  • Microsoft Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) 16.9.17
  • Microsoft Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10) 16.11.10
  • Microsoft Microsoft Visual Studio 2022 version 17.0 17.0.6
  • Microsoft Visual Studio 2019 for Mac version 8.10 8.10.18
  • Microsoft .NET 5.0 5.0.14
  • Microsoft .NET 6.0 6.0.2
  • rh-dotnet50-dotnet RHEL 5.0 DOTNET 5.0.211-1.el7_9
  • rh-dotnet50-dotnet-host RHEL 5.0 DOTNET 5.0.14-1.el7_9
  • rh-dotnet50-dotnet-sdk-5.0 RHEL 5.0 DOTNET 5.0.211-1.el7_9
  • rh-dotnet50-dotnet-hostfxr-5.0 RHEL 5.0 DOTNET 5.0.14-1.el7_9
  • rh-dotnet50-dotnet-runtime-5.0 RHEL 5.0 DOTNET 5.0.14-1.el7_9
  • rh-dotnet50-dotnet-templates-5.0 RHEL 5.0 DOTNET 5.0.211-1.el7_9
  • rh-dotnet50-aspnetcore-runtime-5.0 RHEL 5.0 DOTNET 5.0.14-1.el7_9
  • rh-dotnet50-dotnet-apphost-pack-5.0 RHEL 5.0 DOTNET 5.0.14-1.el7_9

red hat advisories RHSA-2022:0499RHSA-2022:0500RHSA-2022:0496RHSA-2022:0495

  • dotnet AlmaLinux 8 6.0.102-1.el8_5
  • dotnet-host AlmaLinux 8 6.0.2-1.el8_5
  • dotnet-sdk-6.0 AlmaLinux 8 6.0.102-1.el8_5
  • dotnet-hostfxr-6.0 AlmaLinux 8 6.0.2-1.el8_5
  • dotnet-runtime-6.0 AlmaLinux 8 6.0.2-1.el8_5
  • dotnet-templates-6.0 AlmaLinux 8 6.0.102-1.el8_5
  • aspnetcore-runtime-6.0 AlmaLinux 8 6.0.2-1.el8_5
  • dotnet-apphost-pack-6.0 AlmaLinux 8 6.0.2-1.el8_5

almalinux advisories ALSA-2022:0496

  • dotnet6.0 Rocky Linux 8 6.0.102-1.el8_5
  • dotnet5.0 Rocky Linux 8 5.0.211-1.el8_5

rocky linux advisories RLSA-2022:0496RLSA-2022:0495

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-2022-21986 updated cvss 7.5

dotnet: ASP.NET Core Krestel HTTP headers pooling denial of service

  • Red Hat .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet50-dotnet 5.0.211-1.el7_9, rh-dotnet60-dotnet 6.0.102-1.el7_9, rh-dotnet60-dotnet-host 6.0.2-1.el7_9, rh-dotnet50-dotnet-host 5.0.14-1.el7_9, rh-dotnet50-dotnet-sdk-5.0 5.0.211-1.el7_9, rh-dotnet60-dotnet-sdk-6.0 6.0.102-1.el7_9, +18 more Red Hat .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet50-dotnet 5.0.211-1.el7_9, rh-dotnet60-dotnet 6.0.102-1.el7_9, rh-dotnet60-dotnet-host 6.0.2-1.el7_9, rh-dotnet50-dotnet-host 5.0.14-1.el7_9, rh-dotnet50-dotnet-sdk-5.0 5.0.211-1.el7_9, rh-dotnet60-dotnet-sdk-6.0 6.0.102-1.el7_9, +18 more Red Hat .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet50-dotnet 5.0.211-1.el7_9, rh-dotnet60-dotnet 6.0.102-1.el7_9, rh-dotnet60-dotnet-host 6.0.2-1.el7_9, rh-dotnet50-dotnet-host 5.0.14-1.el7_9, rh-dotnet50-dotnet-sdk-5.0 5.0.211-1.el7_9, rh-dotnet60-dotnet-sdk-6.0 6.0.102-1.el7_9, +18 more
    fixed: vendor fix RHSA-2022:0499
  • Red Hat CodeReady Linux Builder (v. 8) dotnet-sdk-5.0-source-built-artifacts 5.0.211-1.el8_5 Red Hat Enterprise Linux AppStream (v. 8) dotnet 6.0.102-1.el8_5, dotnet-host 6.0.2-1.el8_5, dotnet5.0 5.0.211-1.el8_5, dotnet6.0 6.0.102-1.el8_5, dotnet-sdk-5.0 5.0.211-1.el8_5, dotnet-sdk-6.0 6.0.102-1.el8_5, +15 more
    fixed: vendor fix RHSA-2022:0495
  • Red Hat .NET Core 3.1 on Red Hat Enterprise Linux rh-dotnet31, rh-dotnet31-runtime Red Hat Enterprise Linux 8 dotnet, dotnet3.1, dotnet-host, dotnet-sdk-3.1, dotnet-hostfxr-3.1, dotnet-runtime-3.1, +7 more Red Hat Enterprise Linux 9 dotnet3.1
    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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
31 d ago

Exploit prediction

3.60% chance of exploitation in the next 30 days, higher than 89% 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:U/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
NVD 2.0 4.3 AV:N/AC:M/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.win-x64
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-x64
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-x86
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.osx-x64
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-arm64
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-arm
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-arm64
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-arm
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.osx-arm64
>=6.0.0, <6.0.2
6.0.2
bitnami dotnet
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2
bitnami dotnet-sdk
>=5.0.0, <5.0.14
>=6.0.0, <6.0.2
5.0.14
6.0.2

Affected products

  • Microsoft Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)
  • Microsoft Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)
  • Microsoft Microsoft Visual Studio 2022 version 17.0
  • Microsoft Visual Studio 2019 for Mac version 8.10
  • Microsoft .NET 5.0
  • Microsoft .NET 6.0

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.