Unspecified vulnerability in the Java Plug-in in Java SE Development Kit (JDK) and Java Runtime Environment (JRE) 5.0 Update 17 and earlier; 6 Update 12 and earlier; 1.4.2_19 and earlier; and 1.3.1_24 and earlier allows remote attackers to access files and execute arbitrary code via unknown vectors related to "deserializing applets," aka CR 6646860.