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CVE-2001-0664

Internet Explorer 5.5 and 5.01 allows remote attackers to bypass security restrictions via malformed URLs that contain dotless IP addresses, which causes Internet Explorer to process the page in the Intranet Zone, which may have fewer security restrictions, aka the "Zone Spoofing vulnerability."

Published: Oct 30, 2001 Modified: Jun 16, 2026

CVSS Metrics

Affected Products (2)

Vendor Product Version
microsoft internet_explorer 5.01
microsoft internet_explorer 5.5

GitHub Security Advisory GHSA-35hr-3jc6-7qrp

Internet Explorer 5.5 and 5.01 allows remote attackers to bypass security restrictions via...

Risk Scores

CVSS Score 7.5 / 10
EPSS Score 18.19%

Top 3% most likely to be exploited

Threat Score 35.5 / 100

Data Sources

NVD EPSS GitHub