Coverage › CVE-2021-43890
CVE-2021-43890 Unmapped
Microsoft Windows AppX Installer Spoofing Vulnerability
- Vendor / product
- Microsoft — Windows
- Description (CISA)
- Microsoft Windows AppX Installer contains a spoofing vulnerability which has a high impacts to confidentiality, integrity, and availability.
- Added to KEV
- 2021-12-15
- Due date
- 2021-12-29
- Required action
- Apply updates per vendor instructions.
- Known ransomware use
- Known
- CWE
- none recorded by CISA
- CISA notes
- https://nvd.nist.gov/vuln/detail/CVE-2021-43890
- Elsewhere
- cve.org · NVD · CISA KEV · JSON
ATT&CK techniques
No public source states how this vulnerability is exploited in ATT&CK terms.
The only authoritative CVE → ATT&CK mapping in the open — CTID's Mappings Explorer, pinned to a KEV snapshot of 2025-07-28 and ATT&CK 16.1 — does not include CVE-2021-43890. CISA's catalogue carries no technique field. kevmap does not infer techniques from the CWE — here is why — and does not guess.
This page will change state automatically if a mapping is published. What is shown above is everything CISA publishes about the entry.