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CVE-2021-43890: Microsoft Windows AppX Installer Spoofing Vulnerability

criticalknown exploitedCVE-2021-43890
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft Windows AppX Installer contains a spoofing vulnerability which has a high impacts to confidentiality, integrity, and availability.

CSIRTS triage

vendor: Microsoftproduct: Windows AppX InstallerOther
What
The Windows AppX Installer has a spoofing vulnerability affecting confidentiality, integrity, and availability.
Who is affected
Users of Microsoft Windows with the AppX Installer.
Urgency
Remediation is critical due to active exploitation and high impact.
Action
Install the latest security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-12-15
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-43890

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-43890coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Windows AppX

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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