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CVE-2022-21986

26
FAUCET Score

CVE-2022-21986 is a Denial of Service vulnerability affecting Microsoft .NET and Visual Studio 2019/2022, as well as Fedora Project distributions. With a CVSS score of 7.5 (High), this vulnerability can be exploited remotely with low attack complexity, leading to a complete denial of service without requiring user interaction or privileges. While there is no evidence of active exploitation, public exploit code, or inclusion in CISA's KEV catalog, it has garnered some community discussion and media coverage, indicating awareness within the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.0, < 5.0.14CPE matchmatch criteria
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
>= 6.0.0, < 6.0.2CPE matchmatch criteria
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
>= 8.10, < 8.10.18CPE matchmatch criteria
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:macos:*:*
>= 16.0, <= 16.11CPE matchmatch criteria
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*
>= 17.0, < 17.0.6CPE matchmatch criteria
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.74%
Probability of exploitation in next 30 days
EPSS Percentile
88.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0374 is in the 80th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (33)

microsoftpatch availablevia msrc
Product: .NET 6.0Fixed in: 6.0.2
View patch
microsoftpatch availablevia msrc
Product: .NET 5.0Fixed in: 5.0.14
View patch
microsoftpatch availablevia msrc
Product: Visual Studio 2019 for Mac version 8.10Fixed in: 8.10.18
View patch
microsoftpatch availablevia msrc
Product: Microsoft Visual Studio 2022 version 17.0Fixed in: 17.0.6
View patch
microsoftpatch availablevia msrc
Product: Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)Fixed in: 16.9.17
View patch
microsoftpatch availablevia msrc
Product: Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)Fixed in: 16.11.10
View patch
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-armFixed in: 5.0.14
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-arm64Fixed in: 5.0.14
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-armFixed in: 5.0.14
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-musl-arm64Fixed in: 5.0.14
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-musl-armFixed in: 5.0.14
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-armFixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-arm64Fixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-musl-armFixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-musl-arm64Fixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-musl-x64Fixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-x64Fixed in: 5.0.14
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.osx-arm64Fixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.osx-x64Fixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-armFixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-arm64Fixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-x64Fixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-x86Fixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-x64Fixed in: 6.0.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-x64Fixed in: 5.0.14
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.win-x86Fixed in: 5.0.14
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.osx-x64Fixed in: 5.0.14
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-musl-x64Fixed in: 5.0.14
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.App.Runtime.linux-arm64Fixed in: 5.0.14
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: dotnet6.0-0:6.0.102-1.el8_5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: dotnet5.0-0:5.0.211-1.el8_5
View patch
redhatpatch availablevia redhat_api
Product: .NET Core on Red Hat Enterprise LinuxFixed in: rh-dotnet60-dotnet-0:6.0.102-1.el7_9
View patch
redhatpatch availablevia redhat_api
Product: .NET Core on Red Hat Enterprise LinuxFixed in: rh-dotnet50-dotnet-0:5.0.211-1.el7_9
View patch

Vendor Advisories (3)

nugetGHSA-x459-p2rx-f8ffhigh

.NET Denial of Service Vulnerability

Oct 21, 2022
redhatCVE-2022-21986Important

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

Feb 8, 2022
microsoft2022-Feb/CVE-2022-21986Important

.NET Denial of Service Vulnerability

Feb 8, 2022

References

msrc.microsoft.com / update-guide/vulnerability/CVE-2022-21986