CVE-2021-43256
HighUpdated
Published: 15 December 2021
Published
15 December 2021
Modified
19 May 2026
KEV Added
—
Patch
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CVSS Score v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score
0.0095
76.8th percentile
Risk Priority
16
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-43256 is a high-severity an unspecified weakness vulnerability in Microsoft Excel. Its CVSS base score is 7.8 (High).
Operationally, ranked in the top 23.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-30200
Vulnerability details
Microsoft Excel Remote Code Execution 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
excel
2013, 2016
microsoft
excel rt
2013
microsoft
office
2019
microsoft
office long term servicing channel
2021
microsoft
office online server
all versions
microsoft
office web apps
2013
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.