BIT-dotnet-sdk-2022-21986Published

.NET Denial of Service Vulnerability

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CVE-2022-21986

No KEV entry is attached to this observation; this is not evidence that exploitation is absent.

FIRST EPSS: 3.60 % · percentile 89.54 % · scored 9 Nov 2026.

Observed 09 Nov 2026 21:04:24 UTC · Complete immutable risk JSON

cve-program · CVE-2022-21986

Published

.NET Denial of Service Vulnerability

Source published: 9 Feb 2022 16:36:32 UTC
Source modified: 8 Oct 2026 21:24:17 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 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

euvd · EUVD-2022-7179

Published

.NET Denial of Service Vulnerability

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Feb 9, 2022, 4:36:32 PM

dateUpdated: Oct 8, 2026, 9:24:17 PM

5 related source bulletins · separate from aliases

RHSA-2022:0500: Red Hat Security Advisory: .NET 6.0 on RHEL 7 security and bugfix update

CVE-2022-21986

msrc_CVE-2022-21986: .NET Denial of Service Vulnerability

CVE-2022-21986

RHSA-2022:0499: Red Hat Security Advisory: .NET 5.0 on RHEL 7 security and bugfix update

CVE-2022-21986

RHSA-2022:0496: Red Hat Security Advisory: .NET 6.0 security and bugfix update

CVE-2022-21986

RHSA-2022:0495: Red Hat Security Advisory: .NET 5.0 security and bugfix update

CVE-2022-21986

Source published: Feb 9, 2022, 4:36:32 PM (timezone not stated)
Source modified: Oct 8, 2026, 9:24:17 PM (timezone not stated)
Observed here: 9 Nov 2026 23:12:47 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 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

nvd · CVE-2022-21986

Published

.NET Denial of Service Vulnerability

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Modified

Weakness classifications: NVD-CWE-noinfo

Original publisher date fields

published: 2022-02-09T17:15:08.907

lastModified: 2026-10-08T22:17:16.133

6 source CPE criteria · context only

cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:macos:*:*
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 9 Feb 2022 17:15:08 UTC
Source modified: 8 Oct 2026 22:17:16 UTC
Observed here: 24 Oct 2026 19:17:43 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0 · [email protected] · Primary · 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

osv · GHSA-x459-p2rx-f8ff

Published

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 6.0 and .NET 5.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A Denial of Service vulnerability exists in .NET 6.0 and .NET 5.0 when the Kestrel web server processes certain HTTP/2 and HTTP/3 requests. ### Affected Software * Any .NET 6.0 application running on .NET 6.0.1 or lower. * Any .NET 5.0 application running on .NET 5.0.13 or lower. ### Patches To fix the issue, please install the latest version of .NET 6.0 or .NET 5.0. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs. * If you're using .NET Core 6.0, you should download and install Runtime 6.0.2 or SDK 6.0.102 (for Visual Studio 2022 v17.1) from https://dotnet.microsoft.com/download/dotnet-core/6.0. * If you're using .NET 5.0, you should download and install Runtime 5.0.14 or SDK 5.0.114 (for Visual Studio 2019 v16.8) or SDK 5.0.405 (for Visual Studio 2011 v16.11) from https://dotnet.microsoft.com/download/dotnet-core/5.0. .NET 6.0 and .NET 5.0 updates are also available from Microsoft Update. To access this either type "Check for updates" in your Windows search, or open Settings, choose Update & Security and then click Check for Updates. #### Other Details - Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/207 - An Issue for this can be found at https://github.com/dotnet/aspnetcore/issues/40072 - MSRC details for this can be found at https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2022-21986

Source published: 21 Oct 2022 20:29:04 UTC
Source modified: 4 Dec 2024 05:34:12 UTC
Observed here: 23 Oct 2026 16:01:25 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Publisher rating · HIGH