CVE-2021-45335: Avast Antivirus

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Sandbox component in Avast Antivirus prior to 20.4 has an insecure permission which could be abused by local user to control the outcome of scans, and therefore evade detection or delete arbitrary system files.

Affected products

• Avast Antivirus: before 20.4 (fixed in 20.4)

Published 2021-12-27. Last modified 2026-06-17.