CVE-2025-21309

Name: CVE-2025-21309
Creator: NVD / NIST
Published: 2025-01-14T18:15:54.21+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 14.98%

Last modified Jun 17, 2026

CVE-2025-21309 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. Windows Remote Desktop Services Remote Code Execution Vulnerability. EPSS estimates a 14.98% chance of exploitation in the next 30 days.

Description

Windows Remote Desktop Services Remote Code Execution Vulnerability

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

14.98%

96.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-591

Affected Software

Vendor	Product	Versions
Microsoft	Windows Server 2012	All versions
Microsoft	Windows Server 2012	r2
Microsoft	Windows Server 2016	< 10.0.14393.7699
Microsoft	Windows Server 2019	< 10.0.17763.6775
Microsoft	Windows Server 2022	< 10.0.20348.3091
Microsoft	Windows Server 2022 23h2	< 10.0.25398.1369
Microsoft	Windows Server 2025	< 10.0.26100.2894

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21309Patch, Vendor Advisory

Timeline

Published: Jan 14, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-21309?

Windows Remote Desktop Services Remote Code Execution Vulnerability

How severe is CVE-2025-21309?

CVE-2025-21309 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 14.98% probability of exploitation in the next 30 days.

How do I fix CVE-2025-21309?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-21309?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST