What is CVE-2016-3391?

CVE-2016-3391 is a medium-severity vulnerability in Microsoft Edge, classified under Information Disclosure. CVSS score: 5.3/10. Published 2016-10-14.

How severe is CVE-2016-3391?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in Microsoft Edge

CVE-2016-3391

Microsoft Internet Explorer 10 and 11 and Microsoft Edge allow context-dependent attackers to discover credentials by leveraging access to a memory dump, aka "Microsoft Browser Information Disclosure Vulnerability."

Vulnerability class: Information Disclosure

Published 2016-10-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.079 (94.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.079 · newest: 0.079 · change: 0.000

Affected products

Microsoft Edge
Microsoft Internet Explorer — versions 10, 11

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-119 (vendor-advisory)
docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-118 (vendor-advisory)
www.securitytracker.com/id/1036993 (vdb-entry)
www.securitytracker.com/id/1036992 (vdb-entry)
www.securityfocus.com/bid/93379 (vdb-entry)

Frequently asked questions

What is CVE-2016-3391?: CVE-2016-3391 is a medium-severity vulnerability in Microsoft Edge, classified under Information Disclosure. CVSS score: 5.3/10. Published 2016-10-14.
How severe is CVE-2016-3391?: Medium severity. CVSS v3 base score is 5.3 out of 10.