CVE-2026-34021: Wertheim GmbH Wertheim Safecontroller 5400 Hardware For Vault Rooms Safe Deposit Locker System - Microcontroller

High severity, CVSS 8.6. EPSS: 0.3% chance of exploitation in the next 30 days.

The Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320, uses RS-485 communication between the server and the microcontroller without cryptographic protection. An attacker with access to the communication path between the server and the microcontroller can sniff RS-485 messages and replay previously observed messages. This can be used, for example, to spoof a "quit alarm" message and continuously deactivate the safe alarm.

Affected products

• Wertheim GmbH Wertheim Safecontroller 5400 Hardware For Vault Rooms Safe Deposit Locker System - Microcontroller

Published 2026-06-15. Last modified 2026-06-17.