Vulnerability Details : CVE-2021-23842
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.
Products affected by CVE-2021-23842
- cpe:2.3:a:bosch:building_integration_system:*:*:*:*:*:*:*:*
- cpe:2.3:a:bosch:access_professional_edition:*:*:*:*:*:*:*:*
- cpe:2.3:o:bosch:amc2_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:a:bosch:access_management_system:3.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-23842
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 10 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-23842
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
3.6
|
LOW | AV:L/AC:L/Au:N/C:P/I:P/A:N |
3.9
|
4.9
|
NIST | |
|
7.1
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
1.8
|
5.2
|
NIST | |
|
5.7
|
MEDIUM | CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
2.1
|
3.6
|
Robert Bosch GmbH |
CWE ids for CVE-2021-23842
-
The use of a hard-coded cryptographic key significantly increases the possibility that encrypted data may be recovered.Assigned by: psirt@bosch.com (Secondary)
-
The product contains hard-coded credentials, such as a password or cryptographic key.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-23842
-
https://psirt.bosch.com/security-advisories/BOSCH-SA-940448-BT.html
Multiple vulnerabilities in Bosch AMC2 (Access Modular Controller) | Bosch PSIRTMitigation;Vendor Advisory
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