CVE-2026-34021
Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay
- State
- Published
- Severity
- 8.6 High
- Published
- Jun 15, 2026
- Updated
- Jun 15, 2026
- Reserved
- Mar 25, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.6 High | CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | SEC-VLab |
Weaknesses
- CWE-294 Authentication bypass by capture-replay
Affected Products
| Product | Versions |
|---|---|
Wertheim SafeController 5400 Hardware for VAULT ROOMS (Safe Deposit Locker System - Microcontroller)Wertheim GmbH |
|
References
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