Is CVE-2016-3320 in the CISA KEV catalog?

No. CVE-2016-3320 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-3320?

CVE-2016-3320 has a CVSS v3 base score of 4.9 (MEDIUM).

What is the EPSS score for CVE-2016-3320?

CVE-2016-3320 has an EPSS score of 5.01% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2016-3320?

No published fix for CVE-2016-3320 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2016-3320

MEDIUMEPSS 91th pctl

4.9

CVSS v3

NVD

Description

Microsoft Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511 allow attackers to bypass the Secure Boot protection mechanism by leveraging (1) administrative or (2) physical access to install a crafted boot manager, aka "Secure Boot Security Feature Bypass."

CWE-254

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

5.01%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Patch1

docs.microsoft.com

Third-Party Advisory2

Other references1

lists.fedoraproject.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.