CVE-2026-34021CWE-294

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

High · published June 15, 2026

CVSS v4.0
8.6
EPSS
0%
Percentile
16.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.6 · HIGH
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
EPSS
0.00254 · 16.1th percentile
Weakness
CWE-294 · Authentication Bypass by Capture-replay
Published
2026-06-15T10:02Z
EPSS history
Timeline
  • 15 JUN 10:02Z
    Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay
    cvelistv5