CVE-2026-34021 — Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay
The Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320, uses RS-485 communication between the server and the microcontroller without cryptographic p…
Published: 2026-06-15 · CVSS: 8.6 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7