Is CVE-2025-21225 in the CISA KEV catalog?

No. CVE-2025-21225 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-21225?

CVE-2025-21225 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2025-21225?

CVE-2025-21225 has an EPSS score of 1.50% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-21225?

Install KB5049993 for Windows Server 2016. Fixes are available for 9 affected products.

CVE & CISA-KEV Catalog

CVE-2025-21225

MEDIUMEPSS 71th pctl

5.9

CVSS v3

NVD

Description

Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability

CWE-843Type Confusion

How to fix

Remediation Available

Windows Server 2016Windows

Install:KB5049993Microsoft

Windows Server 2016 (Server Core installation)Windows

Install:KB5049993Microsoft

Windows Server 2019Windows

Install:KB5050008Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5050008Microsoft

Windows Server 2022Windows

Install:KB5049983Microsoft

Windows Server 2022 (Server Core installation)Windows

Install:KB5049983Microsoft

Windows Server 2022, 23H2 Edition (Server Core installation)Windows

Install:KB5049984Microsoft

Windows Server 2025Windows

Install:KB5050009Microsoft

Windows Server 2025 (Server Core installation)Windows

Install:KB5050009Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

1.50%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Patch1

msrc.microsoft.com

Related Vulnerabilities

Other CWE-843 (Type Confusion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2011-0611	High	8.8	99%	KEV	Fix
CVE-2012-0507	Critical	9.8	98%	KEV + Ransom	-
CVE-2017-8291	High	7.8	97%	KEV	Fix
CVE-2019-0752	High	7.5	82%	KEV + Ransom	-
CVE-2017-0037	High	8.1	80%	KEV	-
CVE-2016-7201	High	8.8	80%	KEV	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-01-27.