An unauthenticated denial-of-service vulnerability in the device's PLCnext Engineer communication interface allow an remote attacker to interrupt access via the client application. Successful exploitation prevents communication until the PLCnext service is manually restarted.

An unauthenticated denial-of-service vulnerability in the device's PLCnext Engineer communication interface allow an remote attacker to interrupt access via the client application. Successful exploitation prevents communication until the PLCnext service is manually restarted.

This advisory addresses multiple security vulnerabilities in PLCnext firmware versions prior to 2026.0.3. The vulnerabilities may allow unauthenticated attackers to cause denial of service, trigger unexpected system behavior, or execute unauthorized SQL queries. Successful exploitation could impact the availability, integrity, and confidentiality of affected PLCnext Control devices. All issues are resolved in PLCnext firmware version 2026.0.3.