CVE-2021-34909
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. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-14882.
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 confidenceThis is a null pointer dereference vulnerability in Bentley View's JT file parser. The application fails to validate the existence of an object prior to performing operations on it, allowing arbitrary code execution when users open specially crafted malicious JT files.
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. Common paths: C:\Program Files\Bentley\ or look in Windows Programs and Features.Affected if Bentley View or Microstation is installed
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Determine Bentley View versionRight-click the Bentley View executable, select Properties, then look at the Details tab for Version information. Alternatively, open Bentley View and go to Help > About.Affected if Version is present and less than 10.16.02
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Determine Microstation versionOpen Microstation and go to Help > About, or right-click the executable and check Properties > Details for version information.Affected if Version is present and less than 10.16.02
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Confirm JT file handling capabilityCheck if the application can open or preview .jt files. Try opening any existing JT file or check file association settings for .jt extension.Affected if JT file handling is enabled and a vulnerable version is installed
User is affected if running Bentley View or Microstation with version below 10.16.02 and the application can open or parse 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
Users should avoid opening untrusted JT files from unknown or untrusted sources. Apply vendor security patches when released for Bentley View.
10.16.02
- Obtain Bentley View version 10.16.02 or later from the official Bentley website or through your Bentley software distributor
- Obtain Microstation version 10.16.02 or later from the official Bentley website or through your Bentley software distributor
- Apply the update by running the installer for the new version
- Restart the application after the update is complete
- Verify the installed version is 10.16.02 or higher
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-34909 — 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-2021-34909 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
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