CVE-2021-43890

criticalknown exploitedcovered by 1 sourcefirst seen 2021-12-15

Actively exploited. CVE-2021-43890 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-12-15) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

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

CSIRTS triage

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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Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 95% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalexploitedCVE-2021-43890: Microsoft Windows AppX Installer Spoofing Vulnerabilitycisa-kev · 2021-12-15

External references

NVD record for CVE-2021-43890

CVE.org record

CISA KEV catalog

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