Security readout for executives and security teams
Plain-English summary
This vulnerability affects Siemens NX and Solid Edge versions that parse OBJ files unsafely. A malicious OBJ file could cause code to run inside the affected application, putting engineering endpoints and design data at risk if users open untrusted files.
Executive priority
Prioritize remediation where Siemens CAD users exchange external 3D model files. The business risk is code execution on engineering systems, but the source bundle does not indicate active exploitation.
Technical view
CVE-2021-41535 is a CWE-416 use-after-free vulnerability in OBJ file parsing in Siemens NX 1953, NX 1980, and Solid Edge SE2021. The cited description states an attacker could execute code in the context of the current process.
Likely exposure
Exposure is limited to environments running affected Siemens NX 1953, NX 1980, or Solid Edge SE2021 versions and handling OBJ files, especially from external partners, customers, or downloads.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation. The available evidence supports file-parsing risk: exploitation depends on an affected application parsing an OBJ file crafted to trigger the use-after-free.
Researcher notes
Evidence is limited to public CVE, Siemens advisories, and ZDI reference. No CVSS vector is included in the bundle. Treat the issue as a client-side file parser memory-safety flaw with code execution in-process.
Mitigation direction
- Identify affected Siemens NX and Solid Edge installations.
- Upgrade NX 1953 to V1973.3700 or later.
- Upgrade NX 1980 to V1988 or later.
- Upgrade Solid Edge SE2021 to SE2021MP8 or later.
- Check Siemens advisories for any additional product-specific guidance.
- Restrict handling of untrusted OBJ files until upgraded.
Validation and detection
- Inventory Siemens NX and Solid Edge versions across engineering endpoints.
- Confirm NX 1953 builds are V1973.3700 or later.
- Confirm NX 1980 builds are V1988 or later.
- Confirm Solid Edge SE2021 is SE2021MP8 or later.
- Review file-ingestion workflows for untrusted OBJ exposure.
- Check EDR alerts around crashes or abnormal child behavior from affected applications.
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-416: 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-2021-41535 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-728618.pdfCVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-1119/CVE reference · x_refsource_MISC
- https://cert-portal.siemens.com/productcert/pdf/ssa-328042.pdfCVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.