7.1
HIGH
CVE-2021-23842
"Blowfish Encryption Key Disclosure in AMC2"
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.

INFO

Published Date :

Jan. 19, 2022, 9:15 p.m.

Last Modified :

Jan. 28, 2022, 5:58 p.m.

Remotely Exploitable :

No

Impact Score :

5.2

Exploitability Score :

1.8
Affected Products

The following products are affected by CVE-2021-23842 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Bosch access_professional_edition
2 Bosch building_integration_system
3 Bosch amc2_firmware
4 Bosch access_management_system
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-23842.

URL Resource
https://psirt.bosch.com/security-advisories/BOSCH-SA-940448-BT.html Mitigation Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-23842 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-23842 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Jan. 28, 2022

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:P/I:P/A:N)
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
    Changed Reference Type https://psirt.bosch.com/security-advisories/BOSCH-SA-940448-BT.html No Types Assigned https://psirt.bosch.com/security-advisories/BOSCH-SA-940448-BT.html Mitigation, Vendor Advisory
    Added CWE NIST CWE-798
    Added CPE Configuration AND OR *cpe:2.3:o:bosch:amc2_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:bosch:amc2:-:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:bosch:access_management_system:3.0:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:bosch:access_professional_edition:*:*:*:*:*:*:*:* versions up to (including) 3.8.0
    Added CPE Configuration OR *cpe:2.3:a:bosch:building_integration_system:*:*:*:*:*:*:*:* versions up to (excluding) 4.9.1
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-23842 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-23842 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.04 }} 0.00%

score

0.10322

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability