CVE-2003-1025: Microsoft Internet Explorer

Medium severity, CVSS 4.3. EPSS: 26.9% chance of exploitation in the next 30 days.

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."

Affected products

• Microsoft Internet Explorer: version 6.0 only

Published 2004-01-20. Last modified 2026-06-16.