Adobe Flash Player before 11.7.700.257 and 11.8.x and 11.9.x before 11.9.900.170 on Windows and Mac OS X and before 11.2.202.332 on Linux, Adobe AIR before 3.9.0.1380, Adobe AIR SDK before 3.9.0.1380, and Adobe AIR SDK & Compiler before 3.9.0.1380 allow remote attackers to execute arbitrary code via crafted .swf content that leverages an unspecified "type confusion," as exploited in the wild in December 2013.