CVE-2016-3321

LOW

Microsoft Internet Explorer 10 and 11 - Information Disclosure via HTML5 Sandbox IFrame

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-3321. Includes Metasploit module auxiliary/gather/ie_sandbox_findfiles.

AI-analyzed exploit summary This Metasploit module exploits CVE-2016-3321, an information disclosure vulnerability in Internet Explorer 10 & 11. It uses HTML5 sandboxed iframes to determine the existence of local files by observing differences in behavior between existing and non-existent file:// URLs.

Description

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."

Exploits (1)

metasploit WORKING POC
rubypocwin
https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/gather/ie_sandbox_findfiles.rb

This Metasploit module exploits CVE-2016-3321, an information disclosure vulnerability in Internet Explorer 10 & 11. It uses HTML5 sandboxed iframes to determine the existence of local files by observing differences in behavior between existing and non-existent file:// URLs.

Classification
Working Poc 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Internet Explorer 10 & 11
No auth needed
Prerequisites: Local network access or Mark of the Web (MOTW) bypass · Target must access a malicious web page or SVG file
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (6)

Core 6
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1036562
Mailing List, Third Party Advisory mailing-list x_refsource_fulldisc
http://seclists.org/fulldisclosure/2016/Aug/44
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/539174/100/0/threaded
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/92291

Scores

CVSS v3 2.5
EPSS 0.3533
EPSS Percentile 98.2%
Attack Vector LOCAL
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Details

CWE
CWE-200
Status published
Products (2)
microsoft/internet_explorer 10
microsoft/internet_explorer 11
Published Aug 09, 2016
Tracked Since Feb 18, 2026