CVE-2025-21357: 
vulnerability analysis and mitigation

CVE-2025-21357 is a Remote Code Execution vulnerability affecting Microsoft Outlook. The vulnerability was initially disclosed on January 14, 2025, and affects multiple Microsoft products including Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office LTSC 2021, Microsoft Office LTSC 2024, and Microsoft Outlook 2016 (NVD).

The vulnerability has been assigned a CVSS v3.1 Base Score of 6.7 (Medium) with the following vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H. The attack vector is Local (L), requiring high attack complexity (H), low privileges (L), and user interaction (R). The impact metrics show high potential impact on confidentiality, integrity, and availability (NVD).

If successfully exploited, this vulnerability could lead to high impacts on system confidentiality, integrity, and availability. The vulnerability affects multiple versions of Microsoft Office products, potentially exposing a large number of users to security risks (NVD).

Microsoft has released security updates to address this vulnerability. Users are advised to update their Microsoft Office products through the official Microsoft update channels (Microsoft Advisory).