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Fencer Vulns
low 2.5

CVE-2016-3321 json

Microsoft Internet Explorer 10 and 11 load different files for attempts to open a file:// URL depending on whether the file exists, which a…

published 2016-08-09 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-4353

cvss
2.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
37.9%
EPSS 37.9% chance of exploitation in 30 days, percentile 98%
public exploits
1
Metasploit

Summary

Microsoft Internet Explorer 10 and 11 load different files for attempts to open a file:// URL depending on whether the file exists, which allows local users to enumerate files via vectors involving a file:// URL and an HTML5 sandbox iframe, aka "Internet Explorer Information Disclosure Vulnerability."

Timeline

  1. First public exploit (Metasploit auxiliary/gather/ie_sandbox_findfiles)
  2. Published

Exploit prediction

37.95% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
NVD 3.0 2.5 CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

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.