Buffer overflow in Java Web Start in Sun JDK and JRE 6 Update 4 and earlier, 5.0 Update 14 and earlier, and SDK/JRE 1.4.2_16 and earlier allows remote attackers to execute arbitrary code via unknown vectors, a different issue than CVE-2008-1188, aka the "third" issue.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.