Buffer overflow in URLMON.DLL in Microsoft Internet Explorer 5.01 through 6 allows remote attackers to execute arbitrary code via a crafted URL with an International Domain Name (IDN) using double-byte character sets (DBCS), aka the "Double Byte Character Parsing Memory Corruption Vulnerability."
Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.