CVE-2021-46639
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 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 DGN files. Crafted data in a DGN file can trigger a write 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-15511.
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 confidenceA buffer overflow vulnerability exists in Bentley MicroStation CONNECT's DGN file parser. When parsing specially crafted DGN files, the application writes data past the end of an allocated buffer, allowing attackers to execute arbitrary code in the context of the current 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<= 10.16.0.80< 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 productOpen the application and go to Help > About MicroStation (or About Bentley View), or check Programs and Features in Control Panel for the installed version numberAffected if The product listed is MicroStation, MicroStation Connect, or Bentley View with a version lower than 10.16.02 (or <= 10.16.0.80 for Connect)
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Confirm version against affected rangesCompare your installed version number to the following: MicroStation and Bentley View are affected if below 10.16.02; MicroStation Connect is affected if 10.16.0.80 or lowerAffected if Your installed version falls within the affected ranges (< 10.16.02 or <= 10.16.0.80)
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Verify DGN file handling is in useCheck if the application is used to open, view, or edit DGN design files - this is the core vulnerable componentAffected if DGN files are routinely opened or processed in the affected application version
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 for Connect) and use it to handle DGN 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 patches from Bentley Systems when available. Avoid opening untrusted DGN files from unknown sources.
MicroStation/MicroStation Connect/View version 10.16.02 or later
- 1. Identify the current installed version of MicroStation, MicroStation Connect, or View
- 2. Download MicroStation, MicroStation Connect, or View version 10.16.02 or later from the Bentley website or official distribution channels
- 3. Install the updated version following standard Bentley installation procedures
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-46639 — 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-2021-46639 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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