Security readout for executives and security teams
Plain-English summary
Bentley MicroStation CONNECT 10.16.0.80 can be compromised when a user opens a malicious JT file or visits a malicious page that leads to JT parsing. Successful exploitation could run attacker-controlled code as that user, creating business risk around CAD workstations and design data.
Executive priority
Prioritize affected CAD workstations that handle external design files. The issue is high impact but requires user interaction, so urgency should focus on patch verification, supplier-file controls, and user-facing engineering environments.
Technical view
The flaw is a CWE-787 out-of-bounds write in JT file parsing. Crafted JT data can write past an allocated buffer and enable code execution in the current MicroStation process. CVSS is 7.8 high with user interaction required and no privileges required.
Likely exposure
Exposure is most likely on engineering or design endpoints running Bentley MicroStation CONNECT 10.16.0.80, especially where users receive JT files from external partners, email, portals, or web downloads.
Exploitation context
The supplied sources do not show known active exploitation, and the CVE is not marked KEV. Exploitation requires user interaction, so phishing, supplier-file exchange, or malicious project files are the most plausible paths.
Researcher notes
Evidence is limited to the CVE, Bentley reference, and ZDI advisory metadata. Do not claim broader Bentley product impact or in-the-wild exploitation from this bundle. Validate exposure by exact version and JT parsing capability.
Mitigation direction
- Inventory systems running MicroStation CONNECT 10.16.0.80.
- Review Bentley BE-2021-0005 for fixed versions or official workarounds.
- Restrict opening JT files from untrusted or unsolicited sources.
- Apply file handling controls for externally supplied CAD and JT content.
- Use least-privilege workstation accounts where MicroStation is used.
Validation and detection
- Confirm installed MicroStation CONNECT versions on engineering workstations.
- Identify workflows that import or open JT files.
- Check whether Bentley guidance has been applied to affected systems.
- Review security telemetry for MicroStation crashes after untrusted JT handling.
- Track vendor and CVE updates for changed exploitation or remediation status.
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-787: 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-2021-46564 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-22-151/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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.