CVE-2023-22421: Jtekt Kostac PLC Programming Software

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Out-of-bounds read vulnerability exists in Kostac PLC Programming Software (Former name: Koyo PLC Programming Software) Version 1.6.9.0 and earlier. The insufficient buffer size for the PLC program instructions leads to out-of-bounds read. As a result, opening a specially crafted project file may lead to information disclosure and/or arbitrary code execution.

Affected products

• Jtekt Kostac PLC Programming Software: up to and including 1.6.9.0

Published 2023-03-06. Last modified 2026-06-17.