CVE-2019-11230: Avast Antivirus

Medium severity, CVSS 4.4. EPSS: 0.5% chance of exploitation in the next 30 days.

In Avast Antivirus before 19.4, a local administrator can trick the product into renaming arbitrary files by replacing the Logs\Update.log file with a symlink. The next time the product attempts to write to the log file, the target of the symlink is renamed. This defect can be exploited to rename a critical product file (e.g., AvastSvc.exe), causing the product to fail to start on the next system restart.

Affected products

• Avast Antivirus: before 19.4 (fixed in 19.4)

Published 2019-07-18. Last modified 2026-06-17.