CVE tracker / CVE-2025-26671

CVE-2025-26671

CVE-2025-26671 is the Windows Remote Desktop Services Remote Code Execution Vulnerability. Microsoft rates it Important, CVSS 8.1. It is not in CISA's Known Exploited Vulnerabilities catalog. Published April 8, 2025.

Risk summary

HighRemote Code Execution

8.1

CVSS v3 base

1.2%

EPSS: chance of exploitation in 30 days

High

Severity

Important

Microsoft's rating

Less Likely

Microsoft: exploitation

In CISA KEV

Microsoft describes it: “Use after free in Windows Remote Desktop Services allows an unauthorized attacker to execute code over a network.”

How to fix it

Microsoft lists 15 affected products and the update that fixes each:

KB5055519 · fixed build 10.0.17763.7136
Windows Server 2019 (Server Core installation), Windows Server 2019
KB5055521 · fixed build 10.0.14393.7969
Windows Server 2016 (Server Core installation), Windows Server 2016
KB5055523 · fixed build 10.0.26100.3775
Windows Server 2025, Windows Server 2025 (Server Core installation)
KB5055526 · fixed build 10.0.20348.3453
Windows Server 2022 (Server Core installation), Windows Server 2022
KB5055527 · fixed build 10.0.25398.1551
Windows Server 2022, 23H2 Edition (Server Core installation)
KB5055557 · fixed build 6.3.9600.22523
Windows Server 2012 R2 (Server Core installation), Windows Server 2012 R2
KB5055561 · fixed build 6.1.7601.27670
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Windows Server 2008 R2 for x64-based Systems Service Pack 1
KB5055581 · fixed build 6.2.9200.25423
Windows Server 2012, Windows Server 2012 (Server Core installation)

What Microsoft changed

April 8, 2025: Information published.

Details

Weakness: CWE-416: Use After Free
Publicly disclosed (Microsoft): No
Exploited (Microsoft): No
Known exploited (CISA KEV): Not listed
Published: April 8, 2025
Last revised: April 8, 2025

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.