Security readout for executives and security teams
Plain-English summary
CVE-2021-29241 is a denial-of-service issue in CODESYS Gateway 3 versions before 3.5.16.70. The public record says a NULL pointer dereference may disrupt the gateway. Sources do not provide CVSS, attack prerequisites, or active exploitation evidence.
Executive priority
Prioritize verification for environments where gateway downtime could interrupt operations. The business risk is service disruption, not confirmed data theft or code execution based on the supplied sources.
Technical view
The vulnerability is described as a NULL pointer dereference in CODESYS Gateway 3 before 3.5.16.70, with potential DoS impact. The provided sources do not include affected CPEs, CWE mapping, exploitability conditions, authentication requirements, or detailed remediation beyond the fixed-version boundary.
Likely exposure
Organizations running CODESYS Gateway 3 versions earlier than 3.5.16.70 may be exposed. Actual exposure depends on where the gateway is deployed and whether untrusted users or networks can reach it; the supplied sources do not specify attack vector.
Exploitation context
The provided CVE data does not show CISA KEV listing, public exploitation, exploit maturity, or weaponization. Treat exploitation status as unconfirmed unless newer vendor or threat-intelligence sources prove otherwise.
Researcher notes
Evidence is sparse: no CVSS, CWE, CPE, attack vector, or authentication requirement is included. Analysis should stay bounded to the stated NULL pointer dereference and DoS impact in CODESYS Gateway 3 before 3.5.16.70.
Mitigation direction
- Inventory CODESYS Gateway 3 deployments and record exact versions.
- Upgrade versions earlier than 3.5.16.70 per CODESYS guidance.
- Restrict gateway access to trusted management networks.
- Monitor vendor security reports for product-specific remediation details.
- Avoid exposing the gateway service to untrusted networks.
Validation and detection
- Confirm whether CODESYS Gateway 3 is installed or bundled with engineering systems.
- Verify installed version is 3.5.16.70 or later.
- Review network paths that can reach the gateway service.
- Check logs for unexpected gateway crashes or restarts.
- Document compensating controls where immediate upgrade is not possible.
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-2021-29241 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://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14637&token=8dbd75ae7553ae3be25e22f741db783b31e14799&download=CVE reference · x_refsource_MISC
- https://www.codesys.com/security/security-reports.htmlCVE 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.