CVE-2016-3321
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…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 36.1%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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."
- CVSS 3.0
- 2.5 LOWCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 36.14% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- microsoft/internet explorer
- Source
- secure@microsoft.com
EPSS moved from 23.1% on 21 September 2026 to 36.1% on 4 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://seclists.org/fulldisclosure/2016/Aug/44Mailing List, Third Party Advisory
- http://www.securityfocus.com/archive/1/539174/100/0/threaded
- http://www.securityfocus.com/bid/92291
- http://www.securitytracker.com/id/1036562
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-095
- https://www.securify.nl/advisory/SFY20160301/internet_explorer_iframe_sandbox_local_file_name_disclosure_vulnerability.htmlThird Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2016/Aug/44Mailing List, Third Party Advisory
- http://www.securityfocus.com/archive/1/539174/100/0/threaded
- http://www.securityfocus.com/bid/92291
- http://www.securitytracker.com/id/1036562
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-095
- https://www.securify.nl/advisory/SFY20160301/internet_explorer_iframe_sandbox_local_file_name_disclosure_vulnerability.htmlThird Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.