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: 2026-06-15
Score: 8.6 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

Vendor Solution

No fix is available for this issue. The affected SafeController 5400 is end-of-life (EOL), and the vendor stated that no patch will be provided. Affected parties should assess the business risk and switch to a supported version if EOL products are in use.


Vendor Workaround

Physically isolate all SafeController devices so that only authorized personnel can access them. Harden all connected systems that communicate via the serial interface, disable unnecessary services, and restrict access to authorized personnel only. Ensure that servers communicating with SafeController devices use strong, unique authentication credentials and are not accessible to unauthorized users. Maintain physical security of all interconnected components to prevent unauthorized access or tampering.

Tracking

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Advisories

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History

Tue, 23 Jun 2026 21:30:00 +0000

Type Values Removed Values Added
First Time appeared Wertheim
Wertheim safecontroller 5400 Hardware For Vault Rooms (safe Deposit Locker System - Microcontroller)
Vendors & Products Wertheim
Wertheim safecontroller 5400 Hardware For Vault Rooms (safe Deposit Locker System - Microcontroller)

Mon, 15 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 15 Jun 2026 12:00:00 +0000

Type Values Removed Values Added
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.
Title Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay
Weaknesses CWE-294
References
Metrics cvssV4_0

{'score': 8.6, 'vector': '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'}


Subscriptions

Wertheim Safecontroller 5400 Hardware For Vault Rooms (safe Deposit Locker System - Microcontroller)
cve-icon MITRE

Status: PUBLISHED

Assigner: SEC-VLab

Published:

Updated: 2026-06-15T13:10:40.668Z

Reserved: 2026-03-25T10:46:45.515Z

Link: CVE-2026-34021

cve-icon Vulnrichment

Updated: 2026-06-15T13:10:28.635Z

cve-icon NVD

Status : Deferred

Published: 2026-06-15T12:16:24.230

Modified: 2026-06-15T21:05:18.653

Link: CVE-2026-34021

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-23T21:09:47Z

Weaknesses