CVE-2026-34021 (GCVE-0-2026-34021)

Vulnerability from cvelistv5 – Published: 2026-06-15 10:02 – Updated: 2026-06-15 13:10
VLAI
Title
Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay
Summary
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.
Severity
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
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-15 13:10 UTC
CWE
  • CWE-294 - Authentication bypass by capture-replay
Assigner
SEC-VLab CNA under the mitre root
CNA scorecard B 83/100 over 23 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Wertheim GmbH Wertheim SafeController 5400 Hardware for VAULT ROOMS (Safe Deposit Locker System - Microcontroller) Affected: Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320
guessed Create a notification for this product.
Credits
Gorazd Jank, SEC Consult Vulnerability Lab Christian Hager, SEC Consult Vulnerability Lab Philipp Espernberger, SEC Consult Vulnerability Lab
Show details on NVD website
To clipboard 

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