What is the CVSS score of CVE-2019-0859?

CVE-2019-0859 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 9.9%.

Which versions of Windows are affected by CVE-2019-0859?

CVE-2019-0859 presents notable security risk rated CVSS 7.8. Exploitation could compromise the security of affected deployments.. A patch is available.

Is CVE-2019-0859 being actively exploited?

Yes, CVE-2019-0859 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

How to fix or mitigate CVE-2019-0859?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Vendor patch is available.

Windows CVE-2019-0859

HIGH

2019-04-09 secure@microsoft.com

Windows

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 26, 2026 - 11:18 vuln.today

Added to CISA KEV

Oct 29, 2025 - 14:40 cisa

CISA KEV

Patch released

Oct 29, 2025 - 14:40 nvd

Patch available

CVE Published

Apr 09, 2019 - 21:29 nvd

HIGH 7.8

DescriptionCVE.org

An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-0685, CVE-2019-0803.

AnalysisAI

Windows Win32k contains a use-after-free vulnerability enabling local privilege escalation to SYSTEM, exploited in the wild in April 2019 alongside CVE-2019-0803 in targeted campaigns.

Technical ContextAI

The use-after-free in win32k.sys occurs during window object destruction. A crafted application can trigger the free-and-reuse condition to gain arbitrary kernel write primitives for privilege escalation.

Affected ProductsAI

Multiple Windows versions affected

RemediationAI

Apply Microsoft security update. Implement kernel exploit protection via Windows Defender Exploit Guard ASR rules.

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CVE-2019-0859 vulnerability details – vuln.today

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Windows CVE-2019-0859

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

Affected ProductsAI

RemediationAI

More in Windows

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External POC / Exploit Code