CVE-2025-30394: Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 34.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-13 · updated 2026-06-17
Weakness: CWE-591

Description

Sensitive data storage in improperly locked memory in Remote Desktop Gateway Service allows an unauthorized attacker to deny service over a network.

Affected products

Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: before 10.0.14393.8066 — fixed in 10.0.14393.8066
Microsoft Windows Server 2019: before 10.0.17763.7314 — fixed in 10.0.17763.7314
Microsoft Windows Server 2022: before 10.0.20348.3692 — fixed in 10.0.20348.3692
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1611 — fixed in 10.0.25398.1611
Microsoft Windows Server 2025: before 10.0.26100.4061 — fixed in 10.0.26100.4061
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.25475 — fixed in 6.2.9200.25475
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.22577 — fixed in 6.3.9600.22577
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.8066 — fixed in 10.0.14393.8066
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.7314 — fixed in 10.0.17763.7314
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.3692 — fixed in 10.0.20348.3692
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1611 — fixed in 10.0.25398.1611
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.4061 — fixed in 10.0.26100.4061

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2016 10.0.14393.8066; Microsoft Windows Server 2019 10.0.17763.7314; Microsoft Windows Server 2022 10.0.20348.3692; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1611; Microsoft Windows Server 2025 10.0.26100.4061; Microsoft Windows Server 2012 6.2.9200.25475; Microsoft Windows Server 2012 R2 6.3.9600.22577; Microsoft Windows Server 2016 10.0.14393.8066; Microsoft Windows Server 2019 10.0.17763.7314; Microsoft Windows Server 2022 10.0.20348.3692; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1611; Microsoft Windows Server 2025 10.0.26100.4061. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-30394

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