dbcve.org
Amc2 FirmwareOperating system · Bosch

CVE-2021-23843

HIGH · 7.8 CVSS v3.1 Published 2022-01-19
Fix available
A fix is available. Upgrade to 4.9.1 or later.
See remediation →
80/100
Remediation priority · High
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
The Bosch software tools AccessIPConfig.exe and AmcIpConfig.exe are used to configure certains settings in AMC2 devices. The tool allows putting a password protection on configured devices to restrict access to the configuration of an AMC2. An attacker can circumvent this protection and make unauthorized changes to configuration data on the device. An attacker can exploit this vulnerability to manipulate the device\'s configuration or make it unresponsive in the local network. The attacker needs to have access to the local network, typically even the same subnet.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

The AccessIPConfig.exe and AmcIpConfig.exe tools used to configure Bosch AMC2 devices contain a password protection bypass vulnerability. An attacker with local network access (typically same subnet) can circumvent the authentication mechanism and make unauthorized changes to device configuration, potentially rendering the device unresponsive.

MitigationRestrict network access to AMC2 devices and configuration tools using network segmentation and access control lists. Monitor for unauthorized configuration changes and apply vendor patches when available.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Amc2 FirmwareOperating system
Affected:all versions
Access Management SystemApplication
Affected:= 3.0
Access Professional EditionApplication
Affected:<= 3.8.0
Building Integration SystemApplication
Affected:< 4.9.1

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Bosch AMC2 firmware version
    Access the AMC2 device admin interface or check firmware via device management console. Look for firmware version information in system status or device properties.
    Affected if Firmware version is any version (all versions affected)
  2. Check Bosch Access Management System version
    Open the Access Management System application, navigate to About or System Information section to view the installed software version.
    Affected if Version equals 3.0 exactly
  3. Check Bosch Access Professional Edition version
    Launch Access Professional Edition, go to Help > About or check the software version through the control panel add/remove programs.
    Affected if Version is 3.8.0 or lower
  4. Check Bosch Building Integration System version
    Open Building Integration System, locate System Information or About menu to identify the installed software version.
    Affected if Version is lower than 4.9.1
  5. Locate AccessIPConfig.exe or AmcIpConfig.exe tools
    Search the system for these configuration tools using file explorer or command: dir /s C:\AccessIPConfig.exe or dir /s C:\AmcIpConfig.exe. Also check default installation paths under Bosch program directories.
    Affected if Either tool is present on the system
  6. Verify network exposure of AMC2 devices
    Check network configuration of AMC2 devices to determine if they are accessible from the local subnet without proper network segmentation or access controls.
    Affected if Device is reachable from local subnet without network-based access restrictions

A system is affected if it runs any of the listed product versions AND has AMC2 configuration tools accessible on the network, allowing an attacker on the same subnet to bypass authentication.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to 4.9.1 or later
Fixed in 4.9.1
Interim mitigation

Restrict network access to AMC2 devices and configuration tools using network segmentation and access control lists. Monitor for unauthorized configuration changes and apply vendor patches when available.

Fix this in Amc2 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-23843 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data