Security Update for Windows XP SP3 (KB4025218) 
Last Modified: 6/12/2017
Description: A security issue has been identified in a Microsoft software product that could affect your system. You can help protect your system by installing this update from Microsoft. For a complete listing of the issues that are included in this update, see the associated Microsoft Knowledge Base article. After you install this update, you may have to restart your system. 

Description of the security update for Windows XP and Windows Server 2003: June 13, 2017
Windows olecnv32.dll remote code execution vulnerability

A remote code execution vulnerability exists when Microsoft Windows OLE fails to properly validate user input. An attacker could exploit the vulnerability to execute malicious code.

To exploit the vulnerability, an attacker would have to convince a user to open either a specially crafted file or a program from either a webpage or an email message.

The update addresses the vulnerability by correcting how Windows OLE validates user input.

CVE-2017-8487