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Windows 11 24h2 CVE-2026-20870

HIGH
Use After Free (CWE-416)
2026-01-13 secure@microsoft.com
7.8
CVSS 3.1 · Vendor: microsoft
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Severity by source

Vendor (microsoft) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (microsoft) · only source for this CVE.

CVSS VectorVendor: microsoft

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
HIGH 7.8

DescriptionCVE.org

Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

AnalysisAI

Privilege escalation in Windows Win32K ICOMP component via use-after-free memory corruption affects Windows 11 (24h2, 25h2) and Windows Server 2025. An authenticated local attacker can exploit this vulnerability to gain SYSTEM-level privileges with no user interaction required. Currently no patch is available and exploitation requires local access with user-level permissions.

Technical ContextAI

Classified as CWE-416 (Use After Free). Affects Windows 11 24H2. Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

RemediationAI

Monitor vendor advisories for a patch.

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CVE-2026-20870 vulnerability details – vuln.today

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