CVE-2021-29239: Codesys Development System

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

CODESYS Development System 3 before 3.5.17.0 displays or executes malicious documents or files embedded in libraries without first checking their validity.

Affected products

• Codesys Development System: from 3.0, before 3.5.17.0 (fixed in 3.5.17.0)

Published 2021-05-03. Last modified 2026-06-17.