CVE-2021-23842: Bosch Access Management System

High severity, CVSS 7.1. EPSS: 0.1% chance of exploitation in the next 30 days.

Communication to the AMC2 uses a state-of-the-art cryptographic algorithm for symmetric encryption called Blowfish. An attacker could retrieve the key from the firmware to decrypt network traffic between the AMC2 and the host system. Thus, an attacker can exploit this vulnerability to decrypt and modify network traffic, decrypt and further investigate the device\'s firmware file, and change the device configuration. The attacker needs to have access to the local network, typically even the same subnet.

Affected products

• Bosch Access Management System: version 3.0 only
• Bosch Access Professional Edition: up to and including 3.8.0
• Bosch AMC2 Firmware: affected versions not specified
• Bosch Building Integration System: before 4.9.1 (fixed in 4.9.1)

Published 2022-01-19. Last modified 2026-06-17.