Internet Explorer 6.0 SP1 and earlier and possibly other versions allows remote attackers to cause a denial of service (application crash from \memory corruption\) via certain malformed Cascading Style Sheet (CSS) elements that trigger heap-based buffer overflows as demonstrated using the \<STYLE>@;/*\ string possibly due to a missing comment terminator that may cause an invalid length to trigger a large memory copy operation aka the \CSS Heap Memory Corruption Vulnerability.\