CVE-2021-31177

HIGH

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

Title source: llm
STIX 2.1

Description

Microsoft Office Remote Code Execution Vulnerability

References (2)

Core 2
Core References
Third Party Advisory x_refsource_misc
https://www.zerodayinitiative.com/advisories/ZDI-21-576/

Scores

CVSS v3 7.8
EPSS 0.0307
EPSS Percentile 86.0%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE
CWE-416
Status published
Products (10)
microsoft/365_apps
microsoft/excel 2013 sp1 (2 CPE variants)
microsoft/excel 2016
microsoft/office 2013 sp1 (2 CPE variants)
microsoft/office 2016
microsoft/office 2019
microsoft/office_online_server
microsoft/office_web_apps_server 2013 sp1
microsoft/word 2013 sp1 (2 CPE variants)
microsoft/word 2016
Published May 11, 2021
Tracked Since Feb 18, 2026