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CVE record · CVE-2025-21309

Windows Remote Desktop Services Remote Code Execution Vulnerability

CVSS 8.1 HighCriticalEPSS 0.15 · 96th percentile

Critical, because:

  • CVSS score 8.1 (7.0 or more) and EPSS 0.15 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: microsoft) at 14 Jan 2025, 18:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Windows Server 2012
  • affected 6.2.9200.0 to before 6.2.9200.25273 custom
Microsoft Windows Server 2012 (Server Core installation)
  • affected 6.2.9200.0 to before 6.2.9200.25273 custom
Microsoft Windows Server 2012 R2
  • affected 6.3.9600.0 to before 6.3.9600.22371 custom
Microsoft Windows Server 2012 R2 (Server Core installation)
  • affected 6.3.9600.0 to before 6.3.9600.22371 custom
Microsoft Windows Server 2016
  • affected 10.0.14393.0 to before 10.0.14393.7699 custom
Microsoft Windows Server 2016 (Server Core installation)
  • affected 10.0.14393.0 to before 10.0.14393.7699 custom
Microsoft Windows Server 2019
  • affected 10.0.17763.0 to before 10.0.17763.6775 custom
Microsoft Windows Server 2019 (Server Core installation)
  • affected 10.0.17763.0 to before 10.0.17763.6775 custom
Microsoft Windows Server 2022
  • affected 10.0.20348.0 to before 10.0.20348.3091 custom
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
  • affected 10.0.25398.0 to before 10.0.25398.1369 custom
Microsoft Windows Server 2025
  • affected 10.0.26100.0 to before 10.0.26100.2894 custom
Microsoft Windows Server 2025 (Server Core installation)
  • affected 10.0.26100.0 to before 10.0.26100.2894 custom
Identifiers
CVE-2025-21309
CNA
microsoft
Weakness (CWE)
CWE-591
Tags
Published
14 Jan 2025
Updated
9 Jun 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.1 High 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.15, the 96th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 14 Jan 2025. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.