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CVE-2026-34021 | Mondoo Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-34021

CVE-2026-34021

HIGH8.6

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

Published Jun 15, 2026

Modified 1 weeks ago

Details

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

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

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

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

https://www.cve.org/CVERecord?id=CVE-2026-34021

CVSS Analysis

CVSS v4.0

8.6

Exploitability

Attack Vector

AdjacentAV:A

Attack Complexity

LowAC:L

Attack Requirements

NoneAT:N

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Vulnerable System

Vuln. Confidentiality

HighVC:H

Vuln. Integrity

HighVI:H

Vuln. Availability

NoneVA:N

Subsequent System

Subseq. Confidentiality

NoneSC:N

Subseq. Integrity

NoneSI:N

Subseq. Availability

NoneSA:N

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

Weakness Type (CWE)

Other

Ecosystems

Timeline

PublishedJun 15, 2026

ModifiedJun 15, 2026