CVE-2022-4291: Avast Script Shield

Critical severity, CVSS 10.0. EPSS: 0.4% chance of exploitation in the next 30 days.

The aswjsflt.dll library from Avast Antivirus windows contained a potentially exploitable heap corruption vulnerability that could enable an attacker to bypass the sandbox of the application it was loaded into, if applicable. This issue was fixed in version 18.0.1478 of the Script Shield Component.

Affected products

• Avast Script Shield: up to and including 18.0.1473.0

Published 2022-12-08. Last modified 2026-06-17.