What is the CVSS score of CVE-2025-21186?

CVE-2025-21186 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 1.0%.

Which versions of 365 Apps are affected by CVE-2025-21186?

CVE-2025-21186 presents notable security risk, a heap-based buffer overflow vulnerability rated CVSS 7.8.. A patch is available.

How to fix or mitigate CVE-2025-21186?

Within 30 days: Identify all affected systems and apply vendor patches as part of regular patch cycle. If patching is delayed, consider network segmentation to limit exposure.

365 Apps CVE-2025-21186

HIGH

Heap-based Buffer Overflow (CWE-122)

2025-01-14 secure@microsoft.com

Heap Overflow Buffer Overflow RCE Microsoft 365 Apps Access Office Office Long Term Servicing Channel

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

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

HIGH 7.8

DescriptionCVE.org

Microsoft Access Remote Code Execution Vulnerability

AnalysisAI

Microsoft Access Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity.

Technical ContextAI

This vulnerability is classified under CWE-122. Affected products include: Microsoft 365 Apps, Microsoft Access, Microsoft Office, Microsoft Office Long Term Servicing Channel.

RemediationAI

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.