CVE-2026-20854

HIGH
2026-01-13 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
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 7.5

Tags

Windows Use After Free Windows Server 2025 Windows 11 25h2 Windows 11 24h2 Microsoft

Description

Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.

Analysis

Remote code execution in Windows LSASS (Local Security Authority Subsystem Service) on Windows 11 and Windows Server 2025 stems from a use-after-free memory vulnerability exploitable by authenticated attackers over the network. An attacker with valid credentials can trigger the flaw to execute arbitrary code with SYSTEM privileges, achieving complete system compromise. …

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +38
POC: 0

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CVE-2026-20854 vulnerability details – vuln.today
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