Vulnerable Systems:
* Sun Java JDK version 6 Update 18 and prior
* Sun Java JDK version 5.0 Update 23 and prior
* Sun Java JRE version 6 Update 18 and prior
* Sun Java JRE version 5.0 Update 23 and prior
* Sun Java JRE version 1.4.2_25 and prior
The flaw is caused by a buffer overflow error within the Unpack200 component when processing malformed data, which could be exploited by attackers to execute arbitrary code via a malicious archive.