#VU121264 Race condition in Windows and Windows Server - CVE-2026-20927
Published: January 13, 2026
Vulnerability identifier: #VU121264
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-20927
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Windows
Windows Server
Windows
Windows Server
Software vendor:
Microsoft
Microsoft
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a race condition in Windows SMB Server. A remote user can exploit the race and cause a denial of service condition on the target system.
Remediation
Install updates from vendor's website.