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Fencer Vulns
critical 10.0

CVE-2004-0380 in the critical feed json

The MHTML protocol handler in Microsoft Outlook Express 5.5 SP2 through Outlook Express 6 SP1 allows remote attackers to bypass domain rest…

published 2004-04-06 22 y ago modified 2026-06-16 4 mo ago also EUVD-2004-0380

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
63.2%
EPSS 63.2% chance of exploitation in 30 days, percentile 99.2%
public exploits
3
Exploit-DB

Summary

The MHTML protocol handler in Microsoft Outlook Express 5.5 SP2 through Outlook Express 6 SP1 allows remote attackers to bypass domain restrictions and execute arbitrary code, as demonstrated on Internet Explorer using script in a compiled help (CHM) file that references the InfoTech Storage (ITS) protocol handlers such as (1) ms-its, (2) ms-itss, (3) its, or (4) mk:@MSITStore, aka the "MHTML URL Processing Vulnerability."

Patch / fix

Timeline

  1. First public exploit (EDB-23401)
  2. Published

Exploit prediction

63.25% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-23695 Microsoft Internet Explorer 5.0.1 - ITS Protocol Zone Bypass (MS04-013) remote, 2004-02-13
  • EDB-23401 Microsoft Outlook Express 6.0 - MHTML Forced File Execution (2) remote, 2003-11-25
  • EDB-23400 Microsoft Outlook Express 6.0 - '.MHTML' Forced File Execution (1) remote, 2003-11-25
  • securityfocus.com http://www.securityfocus.com/archive/1/358913 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

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.