Security readout for executives and security teams
Plain-English summary
Bentley MicroStation CONNECT 10.16.0.80 can be abused through malicious JT content to run code as the user who opens it. This is not a network worm scenario; it requires the user to visit a malicious page or open a malicious file. Impact is serious for engineering workstations handling untrusted CAD-related files.
Executive priority
Prioritize remediation for engineering and design teams that exchange JT files externally. The vulnerability has high impact but requires user interaction, so urgency is greatest where MicroStation handles third-party files or email-delivered project content.
Technical view
CVE-2021-46580 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. Successful exploitation can execute arbitrary code in the current process with high confidentiality, integrity, and availability impact. CVSS v3.0 is 7.8.
Likely exposure
Exposure is most likely on workstations running Bentley MicroStation CONNECT 10.16.0.80, especially where users open JT files from customers, partners, email, web downloads, or shared project repositories.
Exploitation context
The bundle does not show CISA KEV listing or other evidence of active exploitation. Exploitation requires user interaction: opening a malicious file or visiting a malicious page. Treat this as a targeted document-handling risk rather than unauthenticated remote service exposure.
Researcher notes
ZDI tracks this as ZDI-22-167 and ZDI-CAN-15374. The provided evidence names MicroStation CONNECT 10.16.0.80 only. No exploit steps, public exploit status, or specific patched version details are included in the bundle, so remediation specifics should be verified with Bentley guidance.
Mitigation direction
- Check Bentley advisory BE-2021-0005 for supported fixed versions or workarounds.
- Prioritize updating any MicroStation CONNECT 10.16.0.80 installations.
- Restrict opening JT files from untrusted or unexpected sources.
- Route externally supplied JT files through established review and malware-scanning processes.
- Use least-privilege accounts for engineering workstations where practical.
Validation and detection
- Inventory Bentley MicroStation CONNECT versions across engineering endpoints.
- Identify systems specifically running version 10.16.0.80.
- Review whether users receive or open JT files from external sources.
- Confirm remediation status against Bentley advisory BE-2021-0005.
- Check security telemetry for suspicious activity around MicroStation file-opening events.
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-2021-46580 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-22-167/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.