CVE-2025-21309

Windows Remote Desktop Services Remote Code Execution Vulnerability

CVE-2025-21309 is fixed in 13 products on 1 platform, first by KB5049993, released January 14, 2025. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

Urgent

CVSS

8.1

Critical

Exploitation

More likely

Vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.1506

96th percentile

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows Server 2012		KB5050004	Jan 14, 2025
Windows Server 2012 (Server Core installation)		KB5050004	Jan 14, 2025
Windows Server 2012 R2		KB5050048	Jan 14, 2025
Windows Server 2012 R2 (Server Core installation)		KB5050048	Jan 14, 2025
Windows Server 2016	14393.7699	KB5049993	Jan 14, 2025
Windows Server 2016 (Server Core installation)	14393.7699	KB5049993	Jan 14, 2025
Windows Server 2019	17763.6775	KB5050008	Jan 14, 2025
Windows Server 2019 (Server Core installation)	17763.6775	KB5050008	Jan 14, 2025
Windows Server 2022	20348.3091	KB5049983	Jan 14, 2025
Windows Server 2022 (Server Core installation)	20348.3091	KB5049983	Jan 14, 2025
Windows Server 2022, 23H2 Edition (Server Core installation)	25398.1369	KB5049984	Jan 14, 2025
Windows Server 2025	26100.2894	KB5050009	Jan 14, 2025
Windows Server 2025 (Server Core installation)	26100.2894	KB5050009	Jan 14, 2025

Details

Published
January 14, 2025
Weakness
Sensitive Data Storage in Improperly Locked Memory
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21309

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/cve/CVE-2025-21309">CVE-2025-21309 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Is this on your machines?

Patchblox finds every install below the fixed version on Windows, macOS and Linux, and updates them through your release rings.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.