This is the a zero-day vulnerability disclosed from the Hacking Team leak. It affects all versions of Flash Player for Windows, Mac, and Linux. The bug is a Use-After-Free vulnerability involving the methods TextBlock.createTextLine() and TextBlock.recreateTextLine(textLine). If exploited, it could result in a crash that would allow an attacker to take control of the vulnerable system.
As of this writing, only a proof-of-concept exists; we are continuously monitoring to see if this has been exploited in the wild.
Vulnerability protection in Trend Micro Deep Security protects user systems from threats that may leverage this vulnerability with the following DPI rule: