CVE-2021-43255
medium
Microsoft CVSS v3 Base Score
5.5
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS Score
1.8%
Exploitation probability in 30 days
Top 17% most likely to be exploited
Attack Characteristics
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Confidentiality
None
Integrity
High
Availability
None
Published: December 15, 2021 (1668 days ago)
Last Modified: May 19, 2026
Vendor: Microsoft
Source: NVD
Vulnerability Report
Generated by CyberWatcher
Description
Microsoft Office Trust Center Spoofing Vulnerability
CWE
NVD-CWE-noinfoAffected Products
microsoft 365 appsmicrosoft officemicrosoft office long term servicing channel