Security readout for executives and security teams
Plain-English summary
A malicious JT file or page can make Bentley MicroStation CONNECT 10.16.0.80 run attacker-controlled code when a user opens it. The business risk is workstation compromise for users handling engineering design files, especially where external files are routinely reviewed.
Executive priority
Prioritize remediation for design and engineering teams that exchange third-party JT files. The issue is user-assisted, not confirmed actively exploited in the supplied sources, but successful exploitation could compromise sensitive project workstations.
Technical view
CVE-2021-46579 is a JT file parsing flaw in Bentley MicroStation CONNECT 10.16.0.80. The source describes missing object-existence validation before object operations, mapped to CWE-416, allowing code execution in the current process after user interaction.
Likely exposure
Exposure is most likely on engineering workstations running MicroStation CONNECT 10.16.0.80 and opening JT files from partners, customers, downloads, email, or shared repositories.
Exploitation context
The source bundle does not show KEV listing or active exploitation. Exploitation requires user interaction: visiting a malicious page or opening a malicious file. No exploit procedure is provided here.
Researcher notes
The record describes a user-interaction code execution path through JT parsing. CVSS is 7.8 High with confidentiality, integrity, and availability impact. Remediation details are not included in the source bundle beyond the Bentley advisory reference.
Mitigation direction
- Inventory MicroStation CONNECT installations and identify version 10.16.0.80.
- Review Bentley advisory BE-2021-0005 for the vendor-supported update or remediation path.
- Restrict opening JT files from untrusted or unauthenticated external sources.
- Use email, web, and file-sharing controls to quarantine suspicious JT files.
- Run MicroStation with least-privilege user accounts where operationally feasible.
Validation and detection
- Confirm whether any hosts run MicroStation CONNECT 10.16.0.80.
- Review business workflows that import, preview, or open JT files.
- Check vendor guidance to verify whether installed builds include the remediation.
- Look for recent MicroStation crashes or suspicious activity after JT file handling.
- Validate gateway controls for external JT attachments and downloads.
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
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-2021-46579 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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-22-166/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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.