CVE-2026-20921

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 Race Condition Windows Server 2022 23h2 Windows Server 2022 Windows Server 2025 Windows 11 23h2 Windows Server 2008 Windows Server 2012 Windows 11 24h2 Windows Server 2019 Windows 10 1607 Windows 10 22h2 Windows 11 25h2 Windows 10 21h2 Windows 10 1809 Windows Server 2016 Microsoft

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.

Analysis

Privilege escalation in Windows SMB Server (2022, 2025) stems from improper synchronization of concurrent resource access, enabling authenticated network attackers to gain elevated privileges. The vulnerability requires specific conditions to trigger but provides high-impact unauthorized access when successfully exploited. …

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

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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-2026-20921 vulnerability details – vuln.today
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