CVE-2021-23842

MEDIUM

Bosch AMC2 Firmware - Use of Hard-coded Cryptographic Key

Title source: llm
STIX 2.1

Description

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.

References (1)

Core 1
Core References
Mitigation, Vendor Advisory x_refsource_confirm
https://psirt.bosch.com/security-advisories/BOSCH-SA-940448-BT.html

Scores

CVSS v3 5.7
EPSS 0.0014
EPSS Percentile 4.0%
Attack Vector ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Details

CWE
CWE-321 CWE-798
Status published
Products (4)
bosch/access_management_system 3.0
bosch/access_professional_edition < 3.8.0
bosch/amc2_firmware
bosch/building_integration_system < 4.9.1
Published Jan 19, 2022
Tracked Since Feb 18, 2026