readObject in (1) Java Runtime Environment (JRE) and (2) Software Development Kit (SDK) 1.4.0 through 1.4.2_05 allows remote attackers to cause a denial of service (JVM unresponsive) via crafted serialized data.

Java Runtime Environment (JRE) and Software Development Kit (SDK) 1.4.2 through 1.4.2_02 allows local users to overwrite arbitrary files via a symlink attack on (1) unpack.log, as created by the unpack program, or (2) .mailcap1 and .mime.types1, as created by the RPM program.

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.