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Fencer Vulns
high 7.5

CVE-2001-0664 in the critical feed json

Internet Explorer 5.5 and 5.01 allows remote attackers to bypass security restrictions via malformed URLs that contain dotless IP addresses…

published 2001-10-30 25 y ago modified 2026-06-16 4 mo ago also EUVD-2001-0650

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
18.2%
EPSS 18.2% chance of exploitation in 30 days, percentile 97%
public exploits
1
Exploit-DB

Summary

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."

Timeline

  1. First public exploit (EDB-21118)
  2. Published

Exploit prediction

18.19% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-21118 Microsoft Internet Explorer 5 - Zone Spoofing (MS01-055) remote, 2001-10-10

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.