Security readout for executives and security teams
Plain-English summary
This flaw affects Siemens Simcenter Femap V2020.2 and V2021.1. A malicious NEU file can corrupt memory when opened, potentially letting code run as the Femap user. Risk is highest where engineering teams exchange model files with external parties.
Executive priority
Prioritize remediation for engineering teams that open third-party NEU files. The business risk is workstation compromise through normal design-file handling, with potential impact to sensitive engineering data and downstream systems.
Technical view
CVE-2021-46159 is a CWE-787 out-of-bounds write in Simcenter Femap NEU file parsing. The application writes past the end of an allocated structure while handling a specially crafted NEU file, which could enable code execution in the current process context.
Likely exposure
Exposure is limited to environments running Simcenter Femap V2020.2 or V2021.1 and opening NEU files. Engineering workstations, shared modeling workflows, and partner file exchange channels are the most likely exposure points.
Exploitation context
The sources describe exploitation through a specially crafted NEU file. The CVE is not listed as KEV, and the provided bundle contains no evidence of active exploitation in the wild.
Researcher notes
The bundle does not provide CVSS, fixed-version details, or confirmed exploit activity. Analysis should stay focused on the documented NEU parser memory corruption and Siemens/ZDI advisories for authoritative remediation status.
Mitigation direction
- Inventory Simcenter Femap installations and identify V2020.2 or V2021.1 systems.
- Check Siemens SSA-609880 for vendor-supported updates or remediation guidance.
- Restrict opening NEU files from untrusted or unauthenticated sources.
- Run Femap with least-privilege user accounts where operationally possible.
- Apply workstation endpoint controls for suspicious child processes from Femap.
Validation and detection
- Confirm installed Femap versions on engineering workstations.
- Review whether affected users exchange or import NEU files externally.
- Check Siemens advisory status before declaring remediation complete.
- Review endpoint telemetry for unusual Femap process behavior.
- Verify file intake controls cover NEU attachments and shared folders.
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 lookupCVE-2021-46159 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://cert-portal.siemens.com/productcert/pdf/ssa-609880.pdfCVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-22-314/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.