Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Windows and Windows Server - CVE-2025-29969

Vulnerability identifier: #VU109097

CSH Severity: Medium

CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-29969

CWE-ID: CWE-367

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to a time-of-check, time-of-use (TOCTOU) race condition in MS-EVEN RPC. A remote user can win a race condition and execute arbitrary code on the target system.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.5854, 10 22H2 10.0.19045.5854, 10 1507 10.0.10240.21014, 10 1607 10.0.14393.8066, 10 1809 10.0.17763.7314, 11 22H2 10.0.22621.5335, 11 23H2 10.0.22631.5335, 11 24H2 10.0.26100.3981, 11 24H2 10.0.26100.4061
Windows Server - addressed in versions 2008 R2 6.1.7601.27729, 2008 6.0.6003.23279, 2012 R2 6.3.9600.22577, 2012 6.2.9200.25475, 2016 10.0.14393.8066, 2019 10.0.17763.7314, 2022 23H2 10.0.25398.1611, 2022 10.0.20348.3630, 2022 10.0.20348.3692, 2025 10.0.26100.3981, 2025 10.0.26100.4061

• Exploit #12457 - EventLogin-CVE-2025-29969 (February 27, 2026)

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29969

• Remote code execution in Microsoft MS-EVEN RPC