What’s Vulnerable › Vulnerabilities

CVE-2022-21911: .NET Framework Denial of Service Vulnerability

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-11 · updated 2026-06-17

Description

.NET Framework Denial of Service Vulnerability

Affected products

• Microsoft .NET Framework: 3.5, 4.7.2, 4.6.2, 4.7, 4.7.1, 4.6 (+5)
• Microsoft .NET Framework 2.0 Service Pack 2: from 2.0.0 before 2.0.50727.8955 — fixed in 2.0.50727.8955
• Microsoft .NET Framework 3.5: from 3.5.0 before 2.0.50727.8955 — fixed in 2.0.50727.8955
• Microsoft .NET Framework 3.5.1: from 3.5.0 before 2.0.50727.8955 — fixed in 2.0.50727.8955
• Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2: from 3.0.0.0 before 10.0.14393.4886 — fixed in 10.0.14393.4886
• Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0 before 4.7.3905.0 — fixed in 4.7.3905.0
• Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0 before 4.8.4465.0 — fixed in 4.8.4465.0
• Microsoft .NET Framework 4.5.2: from 4.0.0.0 before 4.0.30319.36720 — fixed in 4.0.30319.36720
• Microsoft .NET Framework 4.6: from 4.0.0.0 before 4.7.3905.0 — fixed in 4.7.3905.0
• Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2: from 4.0.0.0 before 4.7.3905.0 — fixed in 4.7.3905.0
• Microsoft .NET Framework 4.8: from 4.8.0 before 4.8.4465.0 — fixed in 4.8.4465.0

How to fix

Upgrade to a fixed version: Microsoft .NET Framework 2.0 Service Pack 2 2.0.50727.8955; Microsoft .NET Framework 3.5 2.0.50727.8955; Microsoft .NET Framework 3.5.1 2.0.50727.8955; Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 10.0.14393.4886; Microsoft .NET Framework 3.5 AND 4.7.2 4.7.3905.0; Microsoft .NET Framework 3.5 AND 4.8 4.8.4465.0; Microsoft .NET Framework 4.5.2 4.0.30319.36720; Microsoft .NET Framework 4.6 4.7.3905.0; Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 4.7.3905.0; Microsoft .NET Framework 4.8 4.8.4465.0. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21911
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-21911

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