Untrusted Pointer Dereference in Microsoft Office Excel
CVE-2025-62556

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Office Online Server
Microsoft Office 2019
Microsoft 365 Apps For Enterprise
Microsoft Office Ltsc For Mac 2021
Vendor
CVE Published:
9 December 2025

What is CVE-2025-62556?

A vulnerability in Microsoft Office Excel allows an unauthorized attacker to exploit untrusted pointer dereference, potentially enabling local code execution. This can lead to unauthorized access and control over the affected system, posing significant security risks to users. Timely updates and patches are essential to mitigate potential attacks and protect sensitive information.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Excel 2016 32-bit Systems 16.0.0.0 < 16.0.5530.1000

Microsoft Office 2019 32-bit Systems 19.0.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-62556 : Untrusted Pointer Dereference in Microsoft Office Excel