Internet Explorer 5.01, 5.5, and 6 allows remote attackers to spoof a less restrictive security zone and execute arbitrary code via an HTML page containing URLs that contain hostnames that have been double hex encoded, which are decoded twice to generate a malicious hostname, aka the "URL Decoding Zone Spoofing Vulnerability."
AV:N/AC:H/Au:N/C:P/I:P/A:P
This vulnerability has a 24.30% probability of being exploited in the next 30 days, ranking higher than 98% of all scored CVEs.