#VU122550 NULL pointer dereference in Windows and Windows Server - CVE-2026-21525
Published: February 10, 2026
Vulnerability identifier: #VU122550
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:A/U:Green
CVE-ID: CVE-2026-21525
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerable software:
Windows
Windows Server
Windows
Windows Server
Software vendor:
Microsoft
Microsoft
Description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in Windows Remote Access Connection Manager. A local user can perform a denial of service (DoS) attack.
Note, the vulnerability is being exploited in the wild.
Remediation
Install updates from vendor's website.