CVE-2021-33023: Advantech Webaccess

Critical severity, CVSS 9.8. EPSS: 2.3% chance of exploitation in the next 30 days.

Advantech WebAccess versions 9.02 and prior are vulnerable to a heap-based buffer overflow, which may allow an attacker to remotely execute code.

Affected products

• Advantech Webaccess: up to and including 9.0.2

Published 2021-10-18. Last modified 2026-06-17.