CVE-2021-43255
MediumUpdated
Published: 15 December 2021
Published
15 December 2021
Modified
19 May 2026
KEV Added
—
Patch
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CVSS Score v3.1
5.5
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS Score
0.0178
83.1th percentile
Risk Priority
12
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-43255 is a medium-severity an unspecified weakness vulnerability in Microsoft Office. Its CVSS base score is 5.5 (Medium).
Operationally, ranked in the top 16.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-30199
Vulnerability details
Microsoft Office Trust Center Spoofing Vulnerability
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
microsoft
365 apps
all versions
microsoft
office
2013, 2013_rt, 2016, 2019
microsoft
office long term servicing channel
2021
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.