Executive brief
A security vulnerability exists in the Windows component responsible for managing redirected drives, such as those used in remote desktop or network file sharing scenarios. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This could allow them to access sensitive data, install malicious software, or disrupt business operations.
Technical details
This vulnerability is classified as a buffer over-read (CWE-126) and heap-based buffer overflow (CWE-122) within the Windows Redirected Drive Buffering Subsystem (RDBSS). The flaw is triggered when the system incorrectly handles memory buffers during drive redirection operations. To exploit this, an attacker must first have local access to the target system with low-level user privileges. Successful exploitation allows the attacker to execute code with elevated system privileges, potentially leading to a full compromise of the host. Microsoft has released security updates to address this issue across affected Windows and Windows Server versions.
Affected products
- Microsoft Windows 10 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 24H2, 25H2, 26H1
- Microsoft Windows Server 2012 All versions
Timeline
- 2026-07-14: disclosed: Initial publication by Microsoft and NVD.
- 2026-07-14: advisory: Microsoft Security Response Center (MSRC) released the update guide.