CVE-2026-34021

HIGH

Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay

Title source: cna

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.

References (3)

Core 3

Core References

Product product

https://wertheim-safes.com/safe-deposit-boxes/

Third Party Advisory third-party-advisory

https://r.sec-consult.com/wertdev

Vendor Advisory

https://sec-consult.com/vulnerability-lab/advisory/multiple-vulnerabilities-in-wertheim-safecontroller-hardware-for-vault-rooms-safe-deposit-locker-system-microcontroller/

Scores

CVSS v4 8.6

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-294

Status published

Products (1)

Wertheim GmbH/Wertheim SafeController 5400 Hardware for VAULT ROOMS (Safe Deposit Locker System - Microcontroller) Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320

Published Jun 15, 2026

Tracked Since Jun 15, 2026