Medium 9AKK108471A4556 1 CVE

Busch-Welcome® 2 wire Door opener actuator by default in compatibility mode.

Published Jul 21, 2025 · Updated Jul 21, 2025

Vendor: ABB Product: Switch Actuator 4 DU Product: Switch actuator, door/light 4 DU

Summary

ABB is aware of vulnerabilities in the product versions listed as affected in the advisory.
An attacker who successfully exploited this vulnerability could gain physical, unauthorized access to a
Building where the product is installed

Vulnerabilities 1

Medium 6.8

CVE-2025-7705

Authentication bypass due to compatibility mode enabled by default

: Active Debug Code vulnerability in ABB Switch Actuator 4 DU-83330, ABB Switch actuator, door/light 4 DU -83330-500.This issue affects Switch Actuator 4 DU-83330: All Versions; Switch actuator, door/light 4 DU -83330-500: All Versions.

ABB Switch Actuator 4 DU-83330 Switch actuator, door/light 4 DU -83330-500 ICS / OT

Jul 22, 2025

Revision history

2025-07-21 #1
Initial version.

References

ABB CYBERSECURITY ADVISORY - PDF version
https://search.abb.com/library/Download.aspx?DocumentID=9AKK108471A4556&LanguageCode=en&DocumentPartId=pdf&Action=Launch
Guide for network security in building systems control
https://www.busch-jaeger.de/media/download/Broschueren/en/ABB_Smart_Home_Security_2017.pdf