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CVE-2026-21525

Windows Remote Access Connection Manager Denial of Service Vulnerability

Basic Information

CVE State
PUBLISHED
Reserved Date
December 30, 2025
Published Date
February 10, 2026
Last Updated
May 11, 2026
Vendor
Microsoft
Product
Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows 11 Version 26H1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)
Description
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
Tags
cisa

CVSS Scores

CVSS v3.1

6.2 - MEDIUM

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

SSVC Information

Exploitation
active
Technical Impact
partial

Exploit Status

Exploited in the Wild
Yes (2026-06-01 10:50:47 UTC) Source

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525

Known Exploited Vulnerability Information

Source Added Date
CVE 2026-06-01 10:50:47 UTC

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Added to KEVIntel