Security readout for executives and security teams
Plain-English summary
A remote attacker could trick a MicroStation user into opening a malicious FBX file or page. In Bentley MicroStation CONNECT 10.16.0.80, this can expose limited sensitive information from the process. The published CVSS score is low, but the advisory notes it could help enable code execution when chained with other flaws.
Executive priority
Treat this as a low-priority remediation item unless MicroStation users regularly process untrusted design files. Prioritize inventory and vendor guidance review, then fold remediation into normal workstation maintenance unless additional Bentley vulnerabilities are present.
Technical view
CVE-2021-46620 is a CWE-125 out-of-bounds read in Bentley MicroStation CONNECT 10.16.0.80 FBX parsing. The flaw is caused by insufficient validation of user-supplied data, leading to a read past an allocated buffer. Exploitation requires user interaction and has CVSS 3.0 vector AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
Likely exposure
Exposure is limited to environments running Bentley MicroStation CONNECT 10.16.0.80, especially users who open FBX files from external partners, downloads, email, or web content. The bundle does not identify other affected Bentley products or versions.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. Exploitation requires the target to visit a malicious page or open a malicious file. ZDI says the issue can be combined with other vulnerabilities to execute code in the current process context.
Researcher notes
The key constraint is user interaction through malicious page or file handling. The issue is an FBX parser out-of-bounds read with confidentiality impact only in CVSS, but ZDI notes potential chaining value. The bundle does not provide patch version details, proof of exploitation, or broader affected-version ranges.
Mitigation direction
- Identify installations of Bentley MicroStation CONNECT 10.16.0.80.
- Review Bentley BE-2021-0012 and apply vendor-recommended updates or mitigations.
- Restrict opening FBX files from untrusted or unsolicited sources.
- Use email and web controls to quarantine unexpected CAD or FBX attachments.
- Run MicroStation under least-privileged user accounts where operationally feasible.
Validation and detection
- Confirm whether Bentley MicroStation CONNECT 10.16.0.80 is installed.
- Verify Bentley advisory actions were applied to affected workstations.
- Check file-handling workflows for externally supplied FBX files.
- Review endpoint telemetry for unusual MicroStation crashes or suspicious file-open events.
- Document residual exposure where vendor guidance cannot yet be 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-2021-46620 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-2021-0012CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-22-207/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.