CVE-2016-3321

Internet Explorer vulnerability

CVSS

2.5

EPSS

35.3%

EPSS pct

98th

Exploited

No known

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."

Affected vendor

Microsoft

Affected product

Internet Explorer

CVSS vector

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness type (CWE)

CWE-200 — Exposure of Sensitive Information

Published

2016-08-09

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, high attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to low impact to confidentiality.

Its EPSS score of 35.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2016-3321

Confirm whether Microsoft Internet Explorer is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2016-3321.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2016-3321

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2016-3321 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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