CVE-2025-21311

CRITICAL
2025-01-14 [email protected]
9.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 28, 2026 - 18:03 vuln.today
Patch Released
Mar 28, 2026 - 18:03 nvd
Patch available
CVE Published
Jan 14, 2025 - 18:15 nvd
CRITICAL 9.8

Tags

Microsoft Information Disclosure Windows 11 24h2 Windows Server 2022 23h2 Windows Server 2025 Windows

Description

Windows NTLM V1 Elevation of Privilege Vulnerability

Analysis

Windows NTLM V1 Elevation of Privilege Vulnerability. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

Technical Context

This vulnerability is classified under CWE-303. Affected products include: Microsoft Windows 11 24H2, Microsoft Windows Server 2022 23H2, Microsoft Windows Server 2025.

Affected Products

Microsoft Windows 11 24H2, Microsoft Windows Server 2022 23H2, Microsoft Windows Server 2025.

Remediation

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Priority Score

52
Low Medium High Critical
KEV: 0
EPSS: +3.3
CVSS: +49
POC: 0

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CVE-2025-21311 vulnerability details – vuln.today
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