How severe is CVE-2016-3300?

CVE-2016-3300 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-3300 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-3300?

CVE-2016-3300 primarily affects Microsoft Windows 8.1. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-3300?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-3300 published?

CVE-2016-3300 was published on 2016-08-09 and last updated on 2026-06-17.

CVE-2016-3300

CVE-2016-3300 is a high-severity vulnerability in Microsoft Windows 8.1 with a CVSS 3.x base score of 7.8. 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-264.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Microsoft Windows 8.1
Published: 2016-08-09
Last modified: 2026-06-17

Description

The Netlogon service in Microsoft Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT 8.1 improperly establishes secure communications channels, which allows local users to gain privileges by leveraging access to a domain-joined machine, aka "Netlogon Elevation of Privilege Vulnerability."

Frequently asked questions

What is CVE-2016-3300?: The Netlogon service in Microsoft Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT 8.1 improperly establishes secure communications channels, which allows local users to gain privileges by leveraging access to a domain-joined machine, aka "Netlogon Elevation of Privilege Vulnerability."
How severe is CVE-2016-3300?: CVE-2016-3300 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-3300 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-3300?: CVE-2016-3300 primarily affects Microsoft Windows 8.1. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-3300?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-3300 published?: CVE-2016-3300 was published on 2016-08-09 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*

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