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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.

PUBLISHED Reserved 2026-03-25 | Published 2026-06-15 | Updated 2026-06-15 | Assigner SEC-VLab




HIGH: 8.6CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-294 Authentication bypass by capture-replay

Product status

Default status
unknown

Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320
affected

Credits

Gorazd Jank, SEC Consult Vulnerability Lab finder

Christian Hager, SEC Consult Vulnerability Lab finder

Philipp Espernberger, SEC Consult Vulnerability Lab finder

References

sec-consult.com/...fe-deposit-locker-system-microcontroller/ exploit

wertheim-safes.com/safe-deposit-boxes/ product

r.sec-consult.com/wertdev third-party-advisory

cve.org (CVE-2026-34021)

nvd.nist.gov (CVE-2026-34021)

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