CVE-2025-21364

HIGH
2025-01-14 [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 - 18:03 vuln.today
Patch Released
Mar 28, 2026 - 18:03 nvd
Patch available
CVE Published
Jan 14, 2025 - 18:16 nvd
HIGH 7.8

Tags

Microsoft Deserialization 365 Apps Office Long Term Servicing Channel

Description

Microsoft Excel Security Feature Bypass Vulnerability

Analysis

Microsoft Excel Security Feature Bypass Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity. This Deserialization of Untrusted Data vulnerability could allow attackers to execute arbitrary code through malicious serialized objects.

Technical Context

This vulnerability is classified as Deserialization of Untrusted Data (CWE-502), which allows attackers to execute arbitrary code through malicious serialized objects. Affected products include: Microsoft 365 Apps, Microsoft Office Long Term Servicing Channel.

Affected Products

Microsoft 365 Apps, Microsoft Office Long Term Servicing Channel.

Remediation

A vendor patch is available. Apply the latest security update as soon as possible. Avoid deserializing untrusted data. Use safe serialization formats (JSON). Implement integrity checks and type allowlists.

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: +0.2
CVSS: +39
POC: 0

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CVE-2025-21364 vulnerability details – vuln.today
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