HIGHCVSS 7.1Actively exploited · CISA KEV since 2021-12-15Vulnerability

CVE-2021-43890

Microsoft Windows AppX Installer contains a spoofing vulnerability which has a high impacts to confidentiality, integrity, and availability.

Properties

Euvd product
App Installer
Vulnerability name
Microsoft Windows AppX Installer Spoofing Vulnerability
First seen
2026-08-06T03:55:23+00:00
Cvss score
7.1
Epss score
0.11294
Last seen
2026-10-19T12:00:27+00:00
Due date
2021-12-29
Euvd assigner
microsoft
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2021-12-15T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2021-12-15
Euvd base score version
3.1
Score
7.1
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Microsoft
Cvss vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
7.1

Related Entities (14)

AFFECTS_PRODUCT (12)

→[Product]cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_11_21h2:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_21h1:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:microsoft:app_installer:*:*:*:*:*:*:*:*

DESCRIBES (1)

←[KEVEntry]Microsoft Windows AppX Installer Spoofing Vulnerability

INVOLVES (1)

←[Signal]kev_added · 2021-12-15

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CVE-2021-43890 (CVSS 7.1) — Ninja Signal Threat Intelligence | Ninja Signal