Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Windows and Windows Server - CVE-2025-55696

Vulnerability identifier: #VU117285

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-55696

CWE-ID: CWE-367

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a time-of-check, time-of-use (TOCTOU) race condition in NtQueryInformation Token function (ntifs.h). A local user can gain elevated privileges on the target system.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.6456, 10 22H2 10.0.19045.6456, 10 1607 10.0.14393.8519, 10 1809 10.0.17763.7919, 11 22H2 10.0.22621.6060, 11 23H2 10.0.22631.6060, 11 24H2 10.0.26100.6899
Windows Server - addressed in versions 2012 R2 6.3.9600.22824, 2019 10.0.17763.7919, 2022 23H2 10.0.25398.1913, 2022 10.0.20348.4294, 2025 10.0.26100.6899

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-55696

• Privilege escalation in Microsoft NtQueryInformation Token function (ntifs.h)