Sun JRE 5.0 before update 14 allows remote attackers to cause a denial of service (Internet Explorer crash) via an object tag with an encoded applet and an undefined name attribute, which triggers a NULL pointer dereference in jpiexp32.dll when the applet is decoded and passed to the JVM.

Unspecified vulnerability in the Java Runtime Environment (JRE) Applet Class Loader in Sun JDK and JRE 5.0 Update 11 and earlier, 6 through 6 Update 1, and SDK and JRE 1.4.2_14 and earlier, allows remote attackers to violate the security model for an applet's outbound connections by connecting to certain localhost services running on the machine that loaded the applet.

Directory traversal vulnerability in the PersistenceService in Sun Java Web Start in JDK and JRE 5.0 Update 11 and earlier, and Java Web Start in SDK and JRE 1.4.2_13 and earlier, for Windows allows remote attackers to perform unauthorized actions via an application that grants file overwrite privileges to itself. NOTE: this can be leveraged to execute arbitrary code by overwriting a .java.policy file.