Security readout for executives and security teams
Plain-English summary
CVE-2021-46576 affects Bentley MicroStation CONNECT 10.16.0.80. A malicious JT file, or page leading a user to such content, can cause memory corruption and allow code execution as the user running MicroStation. This is serious where design workstations handle external engineering files.
Executive priority
Prioritize remediation for engineering and design teams that exchange JT files externally. The issue can lead to code execution on workstations, but exploitation requires user interaction and no active exploitation is evidenced in the supplied sources.
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 may execute arbitrary code in the current process. The CVSS v3.0 score is 7.8 with user interaction required and no privileges required.
Likely exposure
Exposure is likely limited to environments running Bentley MicroStation CONNECT 10.16.0.80, especially users who open JT files from customers, suppliers, project portals, or other external sources.
Exploitation context
The sources require user interaction: the target must open a malicious file or visit a malicious page. The bundle does not show CISA KEV listing or cited evidence of active exploitation.
Researcher notes
Evidence identifies ZDI-CAN-15370 and ZDI-22-163. Affected scope in the bundle names only MicroStation CONNECT 10.16.0.80. Patch details are not present in the supplied text, so validation should be tied to Bentley’s advisory.
Mitigation direction
- Review Bentley advisory BE-2021-0005 for vendor-supported remediation.
- Update or replace affected MicroStation CONNECT 10.16.0.80 installations per Bentley guidance.
- Restrict opening JT files from untrusted or unsolicited sources.
- Route external JT files through established security review workflows.
- Use least-privilege workstation accounts where MicroStation is used.
Validation and detection
- Inventory endpoints for Bentley MicroStation CONNECT 10.16.0.80.
- Confirm whether users process JT files from external parties.
- Check Bentley advisory BE-2021-0005 for the applicable fixed version or workaround.
- Verify remediated endpoints no longer run the affected build.
- Review recent security alerts involving MicroStation processing unusual JT files.
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-2021-46576 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-22-163/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.