CVE-2025-21356: 
vulnerability analysis and mitigation

Microsoft Office Visio Remote Code Execution Vulnerability (CVE-2025-21356) is a security flaw discovered in Microsoft Office Visio. The vulnerability was disclosed on January 14, 2025, affecting various versions of Microsoft Office, including Microsoft 365 Apps, Office 2019, Office 2021, Office LTSC 2021, Office LTSC 2024, and Office 2024 (NVD).

The vulnerability has been assigned a CVSS v3.1 base score of 7.8 (HIGH) with the following vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The vulnerability is associated with CWE-122 (Heap-based Buffer Overflow) and CWE-843 (Access of Resource Using Incompatible Type - Type Confusion) (NVD).

If successfully exploited, this vulnerability could allow an attacker to execute arbitrary code with the same privileges as the compromised user. Given the high confidentiality, integrity, and availability ratings in the CVSS score, successful exploitation could lead to complete system compromise within the scope of the affected user's permissions (NVD).

Microsoft has released security updates to address this vulnerability. The fix is available through the Microsoft security update guide. Affected users are advised to apply the latest security updates for their respective Office versions (Microsoft Update).