Internet Explorer 5.01 through 6 SP1 allows remote attackers to spoof the domain of a URL via a "%01" character before an @ sign in the user@domain portion of the URL, which hides the rest of the URL, including the real site, in the address bar, aka the "Improper URL Canonicalization Vulnerability."
AV:N/AC:M/Au:N/C:N/I:P/A:N
This vulnerability has a 26.91% probability of being exploited in the next 30 days, ranking higher than 98% of all scored CVEs.