Security readout for executives and security teams
Plain-English summary
Bentley MicroStation CONNECT 10.16.0.80 has a high-severity file parsing flaw. If a user opens a malicious JT file or visits a malicious page, an attacker may run code as that user. This is mainly a risk for design teams handling externally supplied CAD or 3D model files.
Executive priority
Treat as a high-priority workstation application risk for engineering and design environments. It is not described as wormable, but malicious files can convert normal business file exchange into code execution.
Technical view
CVE-2021-46569 is a CWE-787 out-of-bounds write in Bentley MicroStation CONNECT JT file parsing. Crafted JT data can write past an allocated buffer and enable code execution in the current process. The CVSS 3.0 score is 7.8, with no privileges required but user interaction required.
Likely exposure
Exposure is limited to installations of Bentley MicroStation CONNECT 10.16.0.80. Risk is highest where users open JT files from customers, contractors, suppliers, web downloads, or other untrusted sources.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. Public descriptions state exploitation requires user interaction: opening a malicious file or visiting a malicious page. Do not assume exploitation is occurring without additional evidence.
Researcher notes
The key primitive is an out-of-bounds write during JT parsing, tracked as ZDI-CAN-15031. Sources do not provide exploit samples, fixed version details, or active exploitation evidence in the supplied bundle. Validate using version and file-workflow exposure rather than assumptions.
Mitigation direction
- Inventory Bentley MicroStation CONNECT installations and identify version 10.16.0.80.
- Review Bentley advisory BE-2021-0005 for supported updates or mitigations.
- Restrict JT files from untrusted sources until vendor guidance is applied.
- Use endpoint controls to reduce impact from malicious document execution.
- Train affected users to avoid unsolicited CAD or model files.
Validation and detection
- Confirm installed MicroStation versions through software inventory or endpoint management.
- Identify teams that receive or process JT files from external parties.
- Check whether Bentley BE-2021-0005 guidance has been applied.
- Review security telemetry for suspicious MicroStation child processes or crashes.
- Document remaining systems unable to update and apply compensating controls.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-787: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-46569 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.8HighVector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.bentley.com/en/common-vulnerability-exposure/BE-2021-0005CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-22-156/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.