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MicrostationApplication · Bentley

CVE-2021-46620

MEDIUM · 5.5 CVSS v3.1 Published 2022-02-18
Fix available
A fix is available. Upgrade to 10.16.02 or later.
See remediation →
58/100
Remediation priority · Elevated
No privileges

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
This vulnerability allows remote attackers to disclose sensitive information on affected installations of Bentley MicroStation CONNECT 10.16.0.80. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of FBX files. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process. Was ZDI-CAN-15414.

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 · moderate confidence

An out-of-bounds read vulnerability exists in Bentley MicroStation CONNECT 10.16.0.80 when parsing FBX files. The lack of proper validation of user-supplied data during FBX parsing allows attackers to read past the end of an allocated buffer, enabling sensitive information disclosure. This can be chained with other vulnerabilities for arbitrary code execution.

MitigationApply the vendor patch from Bentley when available. Until then, enforce strict policies against opening untrusted FBX files and consider network-based file inspection controls.

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
MicrostationApplication
Affected:< 10.16.02
Microstation ConnectApplication
Affected:<= 10.16.0.80
ViewApplication
Affected:< 10.16.02

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
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

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 Bentley product
    Check Windows Programs and Features or the application's About section for Bentley MicroStation, MicroStation Connect, or Bentley View
    Affected if Any of these three products is installed
  2. Determine installed version
    Open the application, go to Help > About, or check the program's version property in Windows. Note the full version number (e.g., 10.16.0.80)
    Affected if Version is below 10.16.02 for MicroStation/View, or 10.16.0.80 or lower for MicroStation Connect
  3. Confirm FBX parsing capability
    Verify that the installation includes FBX import functionality - check if FBX file type appears in the application's supported import formats or file open dialogs
    Affected if FBX file handling is present in the installation
  4. Check for recent FBX file access
    Review recent file access logs or the application's recent files list for .fbx files opened from untrusted sources
    Affected if Users have opened FBX files with this version of the software

You are affected if you have MicroStation, MicroStation Connect, or Bentley View installed with a version below 10.16.02 (or 10.16.0.80 or lower for Connect) and the FBX parsing feature is available, as the vulnerable code executes when opening malicious FBX files.

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.

dbcve · scoped
Upgrade available Upgrade to 10.16.02 or later
Fixed in 10.16.02
Interim mitigation

Apply the vendor patch from Bentley when available. Until then, enforce strict policies against opening untrusted FBX files and consider network-based file inspection controls.

Recommended fix Moderate confidence

MicroStation 10.16.02 / MicroStation Connect 10.16.0.81 or later

  1. 1. Close any running instances of Bentley MicroStation or MicroStation Connect
  2. 2. Back up your current project files and user preferences as a precaution
  3. 3. Navigate to the Bentley product download page or use the Bentley Softdesk/Product Select tool
  4. 4. Download the latest version: MicroStation 10.16.02 or MicroStation Connect 10.16.0.81 or later
  5. 5. Run the installer and follow the on-screen prompts to complete the upgrade
  6. 6. After installation, verify the version by opening MicroStation and checking Help > About MicroStation
  7. 7. Avoid opening untrusted FBX files from unknown sources until the update is applied

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Microstation Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,060
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.

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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-2021-46620 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