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.

Sun Java Web Start in JDK and JRE 5.0 Update 10 and earlier, and Java Web Start in SDK and JRE 1.4.2_13 and earlier, allows remote attackers to perform unauthorized actions via an application that grants privileges to itself, related to "Incorrect Use of System Classes" and probably related to support for JNLP files.

Sun Java Runtime Environment (JRE) and SDK 1.4.0_01 and earlier allows untrusted applets to access certain information within trusted applets, which allows attackers to bypass the restrictions of the Java security model.

Java Runtime Environment (JRE) Bytecode Verifier allows remote attackers to escape the Java sandbox and execute commands via an applet containing an illegal cast operation, as seen in (1) Microsoft VM build 3802 and earlier as used in Internet Explorer 4.x and 5.x, (2) Netscape 6.2.1 and earlier, and possibly other implementations that use vulnerable versions of SDK or JDK, aka a variant of the "Virtual Machine Verifier" vulnerability.

Vulnerability in Java Runtime Environment (JRE) allows remote malicious web sites to hijack or sniff a web client's sessions, when an HTTP proxy is being used, via a Java applet that redirects the session to another server, as seen in (1) Netscape 6.0 through 6.1 and 4.79 and earlier, (2) Microsoft VM build 3802 and earlier as used in Internet Explorer 4.x and 5.x, and possibly other implementations that use vulnerable versions of SDK or JDK.