Is CVE-2021-43890 actively exploited?

Yes. CVE-2021-43890 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-43890 be exploited remotely?

The attack vector of CVE-2021-43890 has not been classified yet.

What is the CVSS score of CVE-2021-43890?

CVE-2021-43890 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-43890

HIGHCISA KEVIN THE WILD

CVE-2021-43890

Published: December 15, 2021

EPSS:19.56%probability of exploitation in 30 daysPercentile:95.3th

Official Description

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

NVD Source

CISA KEV Advisory

Microsoft Windows AppX Installer Spoofing Vulnerability

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

Added to KEV: 2021-12-15Federal patch deadline: 2021-12-29⚠ USED IN RANSOMWARE CAMPAIGNS

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

Microsoft Windows AppX Installer contains a spoofing vulnerability that significantly impacts confidentiality, integrity, and availability. With an EPSS score of 0.19564, there is a considerable likelihood of exploitation, and CISA has confirmed its active exploitation.

This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog, indicating confirmed real-world attacks.

Recommended Action

Install the latest security updates for Microsoft Windows to patch the AppX Installer spoofing vulnerability. Implement robust security practices to detect and prevent spoofing attempts.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-43890 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-43890 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.