Use of uninitialized resource in Microsoft Windows and Windows Server - CVE-2025-21220

Vulnerability identifier: #VU102690

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-21220

CWE-ID: CWE-908

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to usage of uninitialized resources in Microsoft Message Queuing. A remote attacker can pass specially crafted data to the application, trigger uninitialized usage of resources and gain access to sensitive information on the target system.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.5371, 10 22H2 10.0.19045.5371, 10 1507 10.0.10240.20890, 10 1607 10.0.14393.7699, 10 1809 10.0.17763.6775, 11 22H2 10.0.22621.4751, 11 23H2 10.0.22631.4751, 11 24H2 10.0.26100.3107
Windows Server - addressed in versions 2008 R2 6.1.7601.27520, 2008 6.0.6003.23070, 2012 R2 6.3.9600.22371, 2012 6.2.9200.25273, 2016 10.0.14393.7785, 2022 23H2 10.0.25398.1369, 2022 10.0.20348.3091, 2025 10.0.26100.2894

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21220

• Information disclosure in Microsoft Message Queuing