CVE-2021-34946
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 · uneditedThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley View 10.15.0.75. 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 JT files. Crafted data in a JT file can trigger a read past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-15055.
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 confidenceOut-of-bounds read vulnerability in Bentley View's JT file parser. Crafted malicious JT files trigger a read past the end of an allocated buffer, which can be leveraged for arbitrary code execution in the context of the current user process.
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< 10.16.02< 10.16.02CVSS 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
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 checksWork through these to decide whether this CVE applies to you.
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Identify installed Bentley productCheck program files for Bentley View or Microstation installation folders, or use system inventory tools to list installed software. Common paths: C:\Program Files\Bentley\ or C:\Program Files (x86)\Bentley\Affected if Neither Bentley View nor Microstation is installed on the system
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Determine installed version of Bentley ViewOpen Bentley View, go to Help > About, or check the version in the program's properties (right-click executable > Details). Alternatively, check the version of BENTLEY.View.exe in the installation directoryAffected if Version is present but lower than 10.16.02
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Determine installed version of MicrostationOpen Microstation, go to Help > About, or check the version in the program's properties. Alternatively, check the version of Microstation.exe in the installation directoryAffected if Version is present but lower than 10.16.02
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Confirm JT file handling capabilityAttempt to open or import a JT file using the installed Bentley product, or check file association settings for .jt file extensionsAffected if JT files can be opened or processed by the Bentley software
You are affected if either Bentley View or Microstation is installed with a version lower than 10.16.02 and the software can process JT files.
Generated from the published advisory. Verify against your own configuration.
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 · scoped10.16.02
Apply vendor patch from Bentley when available. Until then, enforce least privilege, restrict JT file handling to trusted sources only, and consider application sandboxing or virtualization for high-risk workflows.
10.16.02 or later
- Download Bentley View version 10.16.02 or later from the official Bentley website
- Download Microstation version 10.16.02 or later from the official Bentley website
- Uninstall the current version of Bentley View and/or Microstation
- Install the updated version (10.16.02 or later)
- Restart the application if it was running during the update
- Verify the installed version by checking About/Help > Version to confirm 10.16.02 or higher is installed
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-34946 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-34946 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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