CVE-2025-21394

HIGH
2025-02-11 [email protected]
7.8
CVSS 3.1
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CVSS Vector

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

Lifecycle Timeline

3
Analysis Generated
Mar 28, 2026 - 18:26 vuln.today
Patch Released
Mar 28, 2026 - 18:26 nvd
Patch available
CVE Published
Feb 11, 2025 - 18:15 nvd
HIGH 7.8

Tags

Use After Free Memory Corruption Microsoft RCE 365 Apps Excel Office Office Long Term Servicing Channel Office Online Server

Description

Microsoft Excel Remote Code Execution Vulnerability

Analysis

Microsoft Excel Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity. This Use After Free vulnerability could allow attackers to access freed memory to execute arbitrary code or crash the application.

Technical Context

This vulnerability is classified as Use After Free (CWE-416), which allows attackers to access freed memory to execute arbitrary code or crash the application. Affected products include: Microsoft 365 Apps, Microsoft Excel, Microsoft Office, Microsoft Office Long Term Servicing Channel, Microsoft Office Online Server.

Affected Products

Microsoft 365 Apps, Microsoft Excel, Microsoft Office, Microsoft Office Long Term Servicing Channel, Microsoft Office Online Server.

Remediation

A vendor patch is available. Apply the latest security update as soon as possible. Use smart pointers or garbage-collected languages. Set pointers to NULL after freeing. Enable memory sanitizers.

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: +0.3
CVSS: +39
POC: 0

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CVE-2025-21394 vulnerability details – vuln.today
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