Security readout for executives and security teams
Plain-English summary
CVE-2021-46600 is an information disclosure issue in Bentley MicroStation CONNECT 10.16.0.80. A user must open a malicious JT file or visit a malicious page. The standalone severity is low, but the disclosure could support a larger exploit chain.
Executive priority
Handle through the normal remediation cycle unless MicroStation users routinely process external design files. In those teams, prioritize version review and safer file-handling controls.
Technical view
The flaw is a CWE-125 out-of-bounds read in JT file parsing. CVSS 3.0 is 3.3 with local attack vector and required user interaction. Sources state it can read beyond an allocated buffer and may be chained with other vulnerabilities for code execution.
Likely exposure
Exposure is limited to environments running Bentley MicroStation CONNECT 10.16.0.80, especially where users receive JT or CAD-related files from external parties.
Exploitation context
The bundle does not show KEV listing or active exploitation. Exploitation requires user interaction through a malicious page or file, reducing broad automated risk but still relevant for targeted file-sharing workflows.
Researcher notes
Evidence is limited to CVE, Bentley, and ZDI records. The source bundle names the affected version and vulnerability class, but does not provide exploit details, a confirmed patch version, or exploitation evidence.
Mitigation direction
- Identify systems running MicroStation CONNECT 10.16.0.80.
- Review Bentley advisory BE-2021-0005 for vendor fix guidance.
- Restrict opening JT files from untrusted sources.
- Use isolated review workflows for externally supplied CAD files.
- Prioritize upgrade planning for users handling third-party design files.
Validation and detection
- Confirm installed MicroStation CONNECT versions on managed endpoints.
- Check whether users process JT files from external parties.
- Verify mail and web controls flag unexpected CAD attachments.
- Review EDR telemetry for suspicious MicroStation child activity.
- Document whether Bentley guidance has been applied.
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-125: 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-2021-46600 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
- Low
- CVSS
- 3.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
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:L/I:N/A:N1.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
3.3LowVector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
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-22-187/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 Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.