Security readout for executives and security teams
Plain-English summary
CVE-2021-30189 is a stack-based buffer overflow in CODESYS V2 Web-Server versions before 1.1.9.20. The source bundle does not provide CVSS, detailed affected product mapping, impact, or attack requirements. Organizations using CODESYS-based control systems should verify whether this web server is present and follow vendor or OEM update guidance.
Executive priority
Treat this as an exposure-discovery task for OT and automation environments. Urgency depends on whether the vulnerable web server is present and reachable; the source bundle lacks severity scoring and exploitation evidence.
Technical view
The CVE description identifies a stack-based buffer overflow in CODESYS V2 Web-Server before version 1.1.9.20. The bundle does not include CWE, CVSS, exploit prerequisites, reachable component details, or confirmed consequences. KEV status is false, so active exploitation is not supported by the provided evidence.
Likely exposure
Exposure is most likely where CODESYS V2 Web-Server is deployed, especially on industrial control or automation systems. The bundle’s affected list is incomplete, so product and OEM-specific exposure must be confirmed through asset inventory and vendor documentation.
Exploitation context
The provided sources do not describe exploit code, exploitation in the wild, authentication requirements, or network reachability conditions. CISA KEV is false in the bundle, so active exploitation should not be claimed from this evidence.
Researcher notes
Evidence is sparse. The reliable facts are the component name, version cutoff, vulnerability class, publication date, and absence from KEV. Do not infer affected OEM devices, exploitability, or impact without additional vendor advisories.
Mitigation direction
- Identify systems running CODESYS V2 Web-Server.
- Check whether versions are earlier than 1.1.9.20.
- Consult CODESYS and OEM guidance before updating production systems.
- Plan upgrade to 1.1.9.20 or later where supported.
- Restrict unnecessary access to affected web interfaces during assessment.
Validation and detection
- Inventory CODESYS-based assets and enabled web-server components.
- Record installed CODESYS V2 Web-Server versions.
- Confirm whether any instance is before 1.1.9.20.
- Review vendor or OEM advisories for device-specific applicability.
- Prioritize validation for remotely reachable OT management interfaces.
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-2021-30189 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=14726&token=553da5d11234bbe1ceed59969d419a71bb8c8747&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.