ms15-129

MS15-129 is a critical security update for Microsoft Silverlight that addresses vulnerabilities allowing remote code execution. The most severe flaw could be exploited if Silverlight mishandles certain open and close requests, leading to read- and write-access violations. An attacker could host a malicious website with a specially crafted Silverlight application and convince a user to visit it, or leverage sites that accept user-provided content. This update resolves these issues and is rated Critical. Users are advised to apply the update promptly to mitigate the risk of remote code execution attacks.