Security readout for executives and security teams
Plain-English summary
CVE-2021-46656 affects Bentley View 10.15.0.75. A malicious JT design file can corrupt memory and allow code execution when a user opens it or is induced to access it through a malicious page. This is high impact, but the provided sources do not show active exploitation.
Executive priority
Treat this as a targeted workstation risk for engineering and design environments. Prioritize asset discovery and vendor-directed remediation where Bentley View handles external JT files. It is not documented as actively exploited in the provided sources, but successful exploitation could give attacker code execution on the user’s machine.
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 execute code in the current Bentley View process. CVSS 3.0 is 7.8 high: low complexity, no privileges required, user interaction required, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely on workstations using Bentley View 10.15.0.75 to inspect JT files, especially where users receive CAD or engineering files from external parties.
Exploitation context
The attacker must convince a target to open a crafted JT file or visit a malicious page. The bundle does not cite CISA KEV listing, public exploitation, or exploit-in-the-wild evidence.
Researcher notes
Key constraints are user interaction and JT parsing exposure. The source bundle identifies only Bentley View 10.15.0.75 as affected and does not provide a fixed version or detailed mitigation text. Do not broaden affected products without vendor evidence.
Mitigation direction
- Inventory Bentley View installations and identify version 10.15.0.75.
- Check Bentley advisory BE-2021-0005 for official upgrade or remediation guidance.
- Avoid opening JT files from untrusted or unexpected sources.
- Route externally received JT files through established malware and content controls.
- Limit Bentley View use to least-privileged user accounts where practical.
Validation and detection
- Confirm whether Bentley View 10.15.0.75 exists on managed endpoints.
- Verify JT file handling procedures for externally supplied engineering files.
- Review mail, web, and file-transfer controls for JT attachment handling.
- Check vendor advisory status before declaring remediation complete.
- Monitor endpoint telemetry for suspicious Bentley View process behavior.
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-2021-46656 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-22-243/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.