Buffer overflow in the decompression algorithm in Research in Motion BlackBerry Enterprise Server 4.0 SP1 and earlier before 20050607 might allow remote attackers to execute arbitrary code via certain data packets.
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.