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CVE-2023-36435: Microsoft QUIC Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-10 · updated 2026-06-17
• Weakness: CWE-400

Description

Microsoft QUIC Denial of Service Vulnerability

Affected products

• Microsoft .NET: from 7.0.0 through 7.0.12
• Microsoft Windows 11 21H2: before 10.0.22000.2538 — fixed in 10.0.22000.2538
• Microsoft Windows 11: before 10.0.22621.2428 — fixed in 10.0.22621.2428
• Microsoft Windows Server 2022: all versions
• Microsoft .NET 7.0: from 7.0.0 before 7.0.13 — fixed in 7.0.13
• Microsoft PowerShell 7.3: from 7.3.0 before 7.3.9 — fixed in 7.3.9
• Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.2538 — fixed in 10.0.22000.2538
• Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.2428 — fixed in 10.0.22621.2428
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.2031 — fixed in 10.0.20348.2031

How to fix

Upgrade to a fixed version: Microsoft Windows 11 21H2 10.0.22000.2538; Microsoft Windows 11 10.0.22621.2428; Microsoft .NET 7.0 7.0.13; Microsoft PowerShell 7.3 7.3.9; Microsoft Windows 11 21H2 10.0.22000.2538; Microsoft Windows 11 10.0.22621.2428; Microsoft Windows Server 2022 10.0.20348.2031. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36435
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36435

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