What’s Vulnerable › Vulnerabilities

CVE-2024-21342: Windows DNS Client Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-13 · updated 2026-08-10
• Weakness: CWE-400

Description

Windows DNS Client Denial of Service Vulnerability

Affected products

• Microsoft Windows 11: before 10.0.22621.3155 — fixed in 10.0.22621.3155
• Microsoft Windows 11: before 10.0.22621.3155 — fixed in 10.0.22621.3155
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.709 — fixed in 10.0.25398.709
• Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.3155 — fixed in 10.0.22621.3155
• Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.3155 — fixed in 10.0.22631.3155
• Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.3155 — fixed in 10.0.22631.3155
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.709 — fixed in 10.0.25398.709

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.22621.3155; Microsoft Windows 11 10.0.22621.3155; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.709; Microsoft Windows 11 10.0.22621.3155; Microsoft Windows 11 version 22H3 10.0.22631.3155; Microsoft Windows 11 10.0.22631.3155; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.709. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21342
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21342

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