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Fencer Vulns
medium 4.3

CVE-2003-1025 json

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 use…

published 2004-01-06 22 y ago modified 2026-06-16 4 mo ago also EUVD-2003-1015

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
26.9%
EPSS 26.9% chance of exploitation in 30 days, percentile 98%
public exploits
3
Exploit-DB

Summary

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."

Timeline

  1. First public exploit (EDB-23423)
  2. Published

Exploit prediction

26.91% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-23465 Opera Browser 6.0 6 - URI Display Obfuscation remote, 2003-12-23
  • EDB-23423 Microsoft Internet Explorer 5/6 / Mozilla 1.2.1 - URI Display Obfuscation (2) remote, 2003-12-09
  • EDB-23422 Microsoft Internet Explorer 5/6 / Mozilla 1.2.1 - URI Display Obfuscation (1) remote, 2003-12-09
  • zapthedingbat.com http://www.zapthedingbat.com/security/ex01/vun1.htm referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation

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.