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Fencer Vulns
medium 5.0

CVE-2001-0643 json

Internet Explorer 5.5 does not display the Class ID (CLSID) when it is at the end of the file name, which could allow attackers to trick th…

published 2001-09-20 25 y ago modified 2026-06-16 4 mo ago also EUVD-2001-0630

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
11.4%
EPSS 11.4% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

Internet Explorer 5.5 does not display the Class ID (CLSID) when it is at the end of the file name, which could allow attackers to trick the user into executing dangerous programs by making it appear that the document is of a safe file type.

Patch / fix

Timeline

  1. First public exploit (EDB-20774)
  2. Published

Exploit prediction

11.36% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-20774 Microsoft Internet Explorer 5.5 - CLSID File Execution remote, 2001-04-17
  • vil.nai.com http://vil.nai.com/vil/virusSummary.asp?virus_k=99048 referenced PoC, tagged "exploit" by a source, unverified
  • securityfocus.com http://www.securityfocus.com/archive/1/176909 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

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.