CVE-2021-43890
Microsoft Windows AppX Installer Spoofing Vulnerability
CVSS
—
No CVSS
EPSS
10.3%
p95
KEV
YES
Dec 15, 2021
Exploit Today
79
0-100
Published: — · Last modified: —
10.3%EPSS · 30 days10.3%
2026-06-302026-07-16
Product
Microsoft / Windows
Vulnerability
Microsoft Windows AppX Installer Spoofing Vulnerability
Added to KEV
Dec 15, 2021
Remediate by
Dec 29, 2021
Known ransomware use
Yes
Summary description
Microsoft Windows AppX Installer contains a spoofing vulnerability which has a high impacts to confidentiality, integrity, and availability.
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-43890
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