CVE-2023-2758: Contec Conprosys HMI System

Medium severity, CVSS 5.3. EPSS: 1% chance of exploitation in the next 30 days.

A denial of service vulnerability exists in Contec CONPROSYS HMI System versions 3.5.2 and prior. When there is a time-zone mismatch in certain configuration files, a remote, unauthenticated attacker may deny logins for an extended period of time.

Affected products

• Contec Conprosys HMI System: before 3.5.3 (fixed in 3.5.3)

Published 2023-05-31. Last modified 2026-06-17.