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

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-02-09 · updated 2026-10-08

Description

.NET Denial of Service Vulnerability

Affected products

Fedoraproject Fedora: 34, 35
Microsoft .NET: from 5.0 before 5.0.14; from 6.0.0 before 6.0.2 — fixed in 5.0.14, 6.0.2
Microsoft Visual Studio 2019: from 8.10 before 8.10.18; from 16.0 through 16.11 — fixed in 8.10.18
Microsoft Visual Studio 2022 version 17.14: from 17.0 before 17.0.6 — fixed in 17.0.6
Microsoft .NET 5.0: from 5.0.0 before 5.0.14 — fixed in 5.0.14
Microsoft .NET 6.0: from 6.0.0 before 6.0.2 — fixed in 6.0.2
Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10): from 16.11.0 before 16.11.10 — fixed in 16.11.10
Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8): from 15.0.0 before 16.9.17 — fixed in 16.9.17
Microsoft Visual Studio 2022 version 17.0: from 17.0.0 before 17.0.6 — fixed in 17.0.6
Microsoft Visual Studio 2019 for Mac version 8.10: from 8.1.0 before 8.10.18 — fixed in 8.10.18

How to fix

Upgrade to a fixed version: Microsoft .NET 5.0.14, 6.0.2; Microsoft Visual Studio 2019 8.10.18; Microsoft Visual Studio 2022 version 17.14 17.0.6; Microsoft .NET 5.0 5.0.14; Microsoft .NET 6.0 6.0.2; Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10) 16.11.10; Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) 16.9.17; Microsoft Visual Studio 2022 version 17.0 17.0.6; Microsoft Visual Studio 2019 for Mac version 8.10 8.10.18. Check the vendor advisory for mitigations.

References

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