What’s Vulnerable › Vulnerabilities

CVE-2021-24111: .NET Framework Denial of Service Vulnerability

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-25 · updated 2026-06-17

Description

.NET Framework Denial of Service Vulnerability

Affected products

• Microsoft .NET Framework: 4.6, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.6.1 (+1)
• Microsoft .NET Framework 4.6: from 4.0.0.0 before publication — fixed in publication
• Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2: from 4.7.0 before publication — fixed in publication
• 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 publication — fixed in publication
• Microsoft .NET Framework 4.7.2: from 10.0.0.0 before publication — fixed in publication
• Microsoft .NET Framework 4.8: from 4.8.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft .NET Framework 4.6 publication; Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 publication; Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 publication; Microsoft .NET Framework 4.7.2 publication; Microsoft .NET Framework 4.8 publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24111
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24111

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