Microsoft Silverlight 3 before 3.0.50611.0 on Windows, and before 3.0.41130.0 on Mac OS X, does not properly handle pointers, which allows …

Microsoft Silverlight 3 before 3.0.50611.0 on Windows, and before 3.0.41130.0 on Mac OS X, does not properly handle pointers, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and framework outage) via a crafted web site, aka "Microsoft Silverlight Memory Corruption Vulnerability."