CVE-2025-21405

CVE-2025-21405 is an Elevation of Privilege vulnerability affecting Visual Studio. It stems from improper access control (CWE-284) and allows attackers to gain elevated privileges on affected systems. The vulnerability carries a CVSS v3.1 base score of 7.3 (AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H), indicating high potential impact if exploited.

A local attacker with low privileges (PR:L) can exploit this vulnerability with low complexity (AC:L), provided they induce user interaction (UI:R), such as clicking a malicious link or file. Successful exploitation enables high confidentiality, integrity, and availability impacts (C:I:A:H), typically resulting in full system compromise through privilege escalation from a standard user account.

Microsoft's Security Response Center (MSRC) provides guidance on this vulnerability at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21405, which details available patches and mitigation steps for Visual Studio users. Security practitioners should prioritize applying these updates to prevent exploitation.