Risk Letters

Exploited vulnerability

CVE-2021-43890

TLP:CLEAR

Microsoft Windows AppX Installer Spoofing Vulnerability

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

Facts

  • Vendor: Microsoft
  • Product: Windows
  • CVSS: 7.1
  • EPSS (probability of exploitation within 30 days): 11.3 %
  • On CISA's Known Exploited Vulnerabilities list since: 15 December 2021
  • First known exploitation: 15 December 2021
  • Used in ransomware campaigns (per CISA): Yes
  • CISA's deadline for US federal agencies: 29 December 2021
  • First seen by Risk Letters: 15 December 2021

Members see which Nordic sectors the flaw hits, and what to do about it.

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD