CVE-2009-3523: Avast Antivirus Home

Medium severity, CVSS 6.9. EPSS: 0.8% chance of exploitation in the next 30 days.

aavmKer4.sys in avast! Home and Professional for Windows before 4.8.1356 does not properly validate input to IOCTLs (1) 0xb2d6000c and (2) 0xb2d60034, which allows local users to gain privileges via IOCTL requests using crafted kernel addresses that trigger memory corruption, a different vulnerability than CVE-2008-1625.

Affected products

• Avast Avast Antivirus Home: up to and including 4.8.1351; version 4.7.827 only; version 4.7.844 only; version 4.7.869 only; version 4.7.1043 only; version 4.7.1098 only; …
• Avast Avast Antivirus Professional: up to and including 4.8.1351; version 4.7.827 only; version 4.7.844 only; version 4.7.1043 only; version 4.7.1098 only; version 4.8.1169 only; …

Published 2009-10-01. Last modified 2026-06-16.