Recommendation. The majority of customers have automatic updating enabled and will not need to take any action because this security update will be downloaded and installed automatically. For more information about the vulnerability, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

The security update addresses the vulnerability by correcting the manner in which applications built using MFC load external libraries. For more information, see the subsection, Affected and Non-Affected Software, in this section. This security update is rated Important for all supported editions of Microsoft Visual Studio and Microsoft Visual C++ Redistributable Package. For an attack to be successful, a user must visit an untrusted remote file system location or WebDAV share and open a document from this location that is then loaded by the affected application. The vulnerability could allow remote code execution if a user opens a legitimate file associated with such an affected application, and the file is located in the same network folder as a specially crafted library file. This security update resolves a publicly disclosed vulnerability in certain applications built using the Microsoft Foundation Class (MFC) Library. Version: 5.0 General Information Executive Summary Security Bulletin Microsoft Security Bulletin MS11-025 - Important Vulnerability in Microsoft Foundation Class (MFC) Library Could Allow Remote Code Execution (2500212)

Microsoft update kb2538242