Security readout for executives and security teams
Plain-English summary
CVE-2021-30191 is a memory-safety flaw in CODESYS V2 Web-Server versions before 1.1.9.20. The source says the software copies input without checking its size, which can destabilize exposed systems. Public severity, CVSS, CWE, and detailed impact are not provided in the supplied sources.
Executive priority
Prioritize discovery and version validation, especially where the web server is reachable beyond trusted networks. Business urgency cannot be scored confidently because public severity and impact data are missing from the supplied sources.
Technical view
The issue is described as a buffer copy without input-size checking in CODESYS V2 Web-Server before 1.1.9.20. The bundle does not provide attack prerequisites, affected CPEs, impact classification, CVSS scoring, or vendor remediation details beyond the version boundary.
Likely exposure
Exposure is limited to environments running CODESYS V2 Web-Server earlier than 1.1.9.20. Risk is higher if that web-server component is enabled and reachable by untrusted users, but the supplied sources do not define default exposure or deployment patterns.
Exploitation context
The source bundle does not show CISA KEV listing, active exploitation, public exploit availability, or proof-of-concept details. Treat exploitation status as unconfirmed from the provided evidence.
Researcher notes
Evidence is sparse. The record gives a vulnerable version range and bug class, but lacks CVSS, CWE, affected CPEs, exploitability notes, and impact details. Further assessment should rely on official CODESYS advisory material and local exposure data.
Mitigation direction
- Inventory systems running CODESYS V2 Web-Server.
- Confirm whether versions are older than 1.1.9.20.
- Review official CODESYS customer advisory guidance.
- Update to a non-affected version where vendor guidance supports it.
- Reduce unnecessary access to the web-server component pending remediation.
Validation and detection
- Check product and component version on each identified host.
- Verify whether CODESYS V2 Web-Server is enabled.
- Confirm the installed version is 1.1.9.20 or later.
- Document internet or untrusted-network reachability.
- Track remediation evidence against the official advisory.
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-2021-30191 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.