VULNERABILITY INTELLIGENCE
CVE-1999-1087
CVSS score7.5 HIGH
EPSS probability6.40%
CISA KEVNot currently listed
Published1999-12-31
Last modified2026-06-16
CVSS vectorAV:N/AC:L/Au:N/C:P/I:P/A:P
Description
Internet Explorer 4 treats a 32-bit number ("dotless IP address") in the a URL as the hostname instead of an IP address, which causes IE to apply Local Intranet Zone settings to the resulting web page, allowing remote malicious web servers to conduct unauthorized activities by using URLs that contain the dotless IP address for their server.