CVE-2026-21245

HIGH
2026-02-10 [email protected]
7.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 - 22:02 vuln.today
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 7.8

Tags

Linux Windows Buffer Overflow Heap Overflow Windows 11 25h2 Windows Server 2025 Windows 11 24h2 Microsoft

Description

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Analysis

Windows Kernel heap overflow in Windows 11 25h2 and Windows Server 2025 enables authenticated local attackers to achieve privilege escalation with high impact on confidentiality, integrity, and availability. The vulnerability requires local access and user privileges but no user interaction, making it a practical attack vector for lateral movement within systems. …

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Remediation

Within 24 hours: Inventory all Windows systems and identify those with high-value assets or sensitive data access; disable unnecessary local admin accounts and review privileged access policies. Within 7 days: Implement enhanced monitoring for privilege escalation attempts and restrict user-to-admin elevation capabilities where operationally feasible; segment critical systems on isolated networks. …

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Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +39
POC: 0

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CVE-2026-21245 vulnerability details – vuln.today
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