Microsoft Windows AppX Installer Spoofing Vulnerability (CVE-2021-43890)
Severity: high · Patch status: patched · Since 2021-12-15 · CVE-2021-43890
Microsoft Windows AppX Installer contains a spoofing vulnerability which has a high impacts to confidentiality, integrity, and availability. CISA added CVE-2021-43890 to its Known Exploited Vulnerabilities catalog on Dec 15, 2021, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by Dec 29, 2021 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
