ABB Busch-Welcome 2 Wire Door Opener Actuator

p a href="https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-148-04.json" strong View CSAF /strong /a /p h2 Summary /h2 p strong 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 /strong /p p The following versions of ABB Busch-Welcome 2 Wire Door Opener Actuator are affected: /p ul li Switch Actuator 4 DU vers:all/* nbsp; /li li Switch actuator, door/light 4 DU vers:all/* nbsp; /li /ul div class="csaf-table" table class="tablesaw tablesaw-stack" data-tablesaw-mode="stack" data-tablesaw-minimap thead tr th role="columnheader" data-tablesaw-priority="persist" CVSS /th th role="columnheader" Vendor /th th role="columnheader" Equipment /th th role="columnheader" Vulnerabilities /th /tr /thead tbody tr td v3 6.8 /td td ABB /td td ABB Busch-Welcome 2 Wire Door Opener Actuator /td td Active Debug Code /td /tr /tbody /table /div h3 Background /h3 ul li strong Critical Infrastructure Sectors: /strong Commercial Facilities /li li strong Countries/Areas Deployed: /strong Worldwide /li li strong Company Headquarters Location: /strong Switzerland /li /ul hr h2 Vulnerabilities /h2 div class="csaf-accordion" p a class="csaf-accordion-toggle-all" href="#" Expand All + /a /p div class="csaf-accordion-item" h3 a class="csaf-accordion-toggle" href="#" CVE-2025-7705 /a /h3 div class="csaf-accordion-content" p Authentication bypass due to compatibility mode enabled by default /p p a href="https://www.cve.org/CVERecord?id=CVE-2025-7705" View CVE Details /a /p hr h4 Affected Products /h4 h5 ABB Busch-Welcome 2 Wire Door Opener Actuator /h5 div class="ics-vendor-version-status" div class="ics-vendor" strong Vendor: /strong br ABB /div div class="ics-version" strong Product Version: /strong br Switch Actuator 4 DU -83330 - All Versions, Switch actuator, door/light 4 DU -83330-500 - All Versions /div div class="ics-status" strong Product Status: /strong br known_affected /div /div div class="ics-remediations" h6 Remediations /h6 p strong Mitigation /strong br The following actions need to be executed on premise where the respective Busch-Welcome® System is installed: • While the Busch-Welcome® System is in operation, toggle the mode switch on the product from “Door-Open” - to “Light” – Mode, wait one second and switch back to “Door-Open” - Mode. • Restart the Busch-Welcome® System with a Power reset (mains power off and on again). By executing the above steps, the system will recalibrate itself during boot up and will correct the misconfiguration automatically. ABB recommends that customers apply the above listed actions at the earliest convenience. /p /div p strong Relevant CWE: /strong a href="https://cwe.mitre.org/data/definitions/489.html" CWE-489 Active Debug Code /a /p hr h4 Metrics /h4 div class="csaf-table csaf-metrics-table" table class="tablesaw tables