CVE-2021-38655

HIGH

Microsoft 365 Apps and Excel - Remote Code Execution via Use-After-Free

Title source: llm

Microsoft Excel Remote Code Execution Vulnerability

Core 2

Core References

Patch, Vendor Advisory x_refsource_misc

Third Party Advisory, VDB Entry x_refsource_misc

CVSS v3 7.8

EPSS 0.0463

EPSS Percentile 90.6%

Attack Vector LOCAL

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

CWE

CWE-416

Status published

Products (6)

microsoft/365_apps

microsoft/excel 2013 (2 CPE variants)

microsoft/excel 2016

microsoft/office 2019 (2 CPE variants)

microsoft/office_online_server

microsoft/office_web_apps 2013 sp1

Published Sep 15, 2021

Tracked Since Feb 18, 2026