What’s Vulnerable › Vulnerabilities

CVE-2023-21538: .NET Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-01-10 · updated 2026-06-17
• Weakness: CWE-502

Description

.NET Denial of Service Vulnerability

Affected products

• Fedoraproject Fedora: 36, 37
• Microsoft .NET: 6.0.0
• Microsoft Powershell: 7.2
• Microsoft .NET 6.0: from 6.0.0 before 6.0.13 — fixed in 6.0.13
• Microsoft PowerShell 7.2: from 7.2.0 before 7.2.9 — fixed in 7.2.9

How to fix

Upgrade to a fixed version: Microsoft .NET 6.0 6.0.13; Microsoft PowerShell 7.2 7.2.9. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21538
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21538

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