Unspecified vulnerability in Java 1.3.1 before 1.3.1_16 on Apple Mac OS X allows an untrusted applet to gain privileges, related to "Mac OS X specific extensions."
Sun Java 1.3.1, 1.4.1, and 1.4.2 allows local users to cause a denial of service (JVM crash), possibly by calling the ClassDepth function with a null parameter, which causes a crash instead of generating a null pointer exception.