CVE-2020-13657: Avast Avg Antivirus

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

An elevation of privilege vulnerability exists in Avast Free Antivirus and AVG AntiVirus Free before 20.4 due to improperly handling hard links. The vulnerability allows local users to take control of arbitrary files.

Affected products

• Avast Avg Antivirus: before 20.4 (fixed in 20.4)
• Avast Free Antivirus: before 20.4 (fixed in 20.4)

Published 2020-06-29. Last modified 2026-06-17.