Security readout for executives and security teams
Plain-English summary
This CVE affects CODESYS Development System 3 versions before 3.5.17.0. A malicious library could contain embedded documents or files that the development system displays or executes without first validating them. The main concern is compromise of an engineering workstation through a trusted-looking project library.
Executive priority
Treat this as a targeted engineering-workstation risk, not a confirmed internet-wide emergency. Prioritize environments using CODESYS for industrial automation development, because workstation compromise can affect sensitive project files and operational engineering workflows.
Technical view
The reported flaw is insufficient validation of documents or files embedded in CODESYS libraries. The CVE states affected versions are CODESYS Development System 3 before 3.5.17.0. No CVSS, CWE, detailed attack prerequisites, or vendor mitigation text are included in the provided bundle.
Likely exposure
Exposure is most likely on engineering workstations running CODESYS Development System 3 before 3.5.17.0, especially where users import or open libraries from vendors, partners, backups, or untrusted sources.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation likely depends on a user or workflow opening a malicious library containing embedded content, but exact prerequisites are not documented here.
Researcher notes
Evidence is limited to the CVE description and CODESYS references. The bundle does not provide CVSS, CWE, exploit maturity, detailed affected CPEs, or exact library-handling mechanics. Avoid assuming runtime PLC exposure without separate vendor evidence.
Mitigation direction
- Upgrade CODESYS Development System 3 to 3.5.17.0 or later where applicable.
- Check CODESYS security reports and customer advisories for official remediation guidance.
- Restrict use of third-party or untrusted CODESYS libraries until validated.
- Keep engineering workstations under standard endpoint protection and least-privilege controls.
Validation and detection
- Inventory engineering systems for CODESYS Development System 3 installations.
- Confirm installed versions are not older than 3.5.17.0.
- Review recent library imports from external or untrusted sources.
- Check endpoint telemetry for suspicious document or file execution from CODESYS workflows.
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.
CVE-2021-29239 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://customers.codesys.com/index.phpCVE reference · x_refsource_MISC
- https://www.codesys.com/security/security-reports.htmlCVE reference · x_refsource_MISC
- https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14639&token=fa836f8bd4a2184aa9323a639ca9f2aaf1538412&download=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.