How severe is CVE-2016-3391?

CVE-2016-3391 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2016-3391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-3391?

CVE-2016-3391 primarily affects Microsoft Edge. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-3391?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-3391 published?

CVE-2016-3391 was published on 2016-10-14 and last updated on 2026-06-17.

CVE-2016-3391

CVE-2016-3391 is a medium-severity vulnerability in Microsoft Edge with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 2.6
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Microsoft Edge
Published: 2016-10-14
Last modified: 2026-06-17

Description

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."

Frequently asked questions

What is 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."
How severe is CVE-2016-3391?: CVE-2016-3391 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2016-3391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-3391?: CVE-2016-3391 primarily affects Microsoft Edge. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-3391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-3391 published?: CVE-2016-3391 was published on 2016-10-14 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:microsoft:edge:-:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:10:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*

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