CVE-2017-8307: Avast Antivirus

Critical severity, CVSS 9.8. EPSS: 1.8% chance of exploitation in the next 30 days.

In Avast Antivirus before v17, using the LPC interface API exposed by the AvastSVC.exe Windows service, it is possible to launch predefined binaries, or replace or delete arbitrary files. This vulnerability is exploitable by any unprivileged user when Avast Self-Defense is disabled. It is also exploitable in conjunction with CVE-2017-8308 when Avast Self-Defense is enabled. The vulnerability allows for Denial of Service attacks and hiding traces of a possible attack.

Affected products

• Avast Antivirus: up to and including 12.3.2279

Published 2017-04-27. Last modified 2026-06-17.