CVE-2021-38408: Advantech Webaccess

Critical severity, CVSS 9.8. EPSS: 11.6% chance of exploitation in the next 30 days.

A stack-based buffer overflow vulnerability in Advantech WebAccess Versions 9.02 and prior caused by a lack of proper validation of the length of user-supplied data may allow remote code execution.

Affected products

• Advantech Webaccess: up to and including 9.02

Published 2021-09-09. Last modified 2026-06-17.