CVE-2025-54899

Published: Sep 9, 2025Modified: Jun 17, 2026

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

Free of memory not on the heap in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Affected (12)

Products: Microsoft: 365 Apps, Excel, Office, Office Long Term Servicing Channel

4 products

Office Long Term Servicing Channel

Configuration A

12 vulnerable

Vulnerable Software	Affected Versions
Microsoft 365 Apps	All versions
Microsoft 365 Apps	All versions
Microsoft Excel	Version 2016
Microsoft Excel	Version 2016
Microsoft Office	Version 2019
Microsoft Office	Version 2019
Microsoft Office Long Term Servicing Channel	Version 2021
Microsoft Office Long Term Servicing Channel	Version 2021
Microsoft Office Long Term Servicing Channel	Version 2021
Microsoft Office Long Term Servicing Channel	Version 2024
Microsoft Office Long Term Servicing Channel	Version 2024
Microsoft Office Long Term Servicing Channel	Version 2024

Related CWEs

Free of Memory not on the Heap

The product calls free() on a pointer to memory that was not allocated using associated heap allocation functions such as malloc(), calloc(), or realloc().

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-54899

Source: secure@microsoft.com

Vendor Advisory

Timeline

No history available yet.