Unspecified vulnerability in the font parsing implementation in Sun JDK and JRE 5.0 Update 9 and earlier, and SDK and JRE 1.4.2_14 and earlier, allows remote attackers to perform unauthorized actions via an applet that grants certain privileges to itself.

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.