LiveActive security incident?Get immediate response
CVE Record

CVE-2021-30186: CODESYS V2 runtime system SP before 2.4.7.55 has a Heap-based Buffer Overflow.

CODESYS V2 runtime system SP before 2.4.7.55 has a Heap-based Buffer Overflow.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-30186 is a heap-based buffer overflow in CODESYS V2 Runtime System SP before 2.4.7.55. This matters because CODESYS runtimes are used in industrial automation environments. The public bundle does not provide severity, impact, or attack-vector detail.

Executive priority

Treat this as an inventory and vendor-remediation priority for operational technology environments. Urgency depends on whether affected CODESYS V2 runtimes are present, exposed, and business-critical; the public bundle lacks severity and exploitation evidence.

Technical view

The CVE record describes a heap-based buffer overflow affecting CODESYS V2 Runtime System SP versions before 2.4.7.55. Supplied sources do not include CVSS, CWE, attack vector, privilege requirements, affected downstream device models, or detailed impact statements.

Likely exposure

Likely exposure is limited to environments running CODESYS V2 Runtime System SP earlier than 2.4.7.55. The supplied data does not identify specific PLC brands, OEM devices, internet-facing services, or deployment patterns.

Exploitation context

The source bundle does not state active exploitation, and KEV status is false. No cited source provides exploit maturity, public exploit availability, or attacker preconditions, so exploitation status should be treated as unconfirmed.

Researcher notes

Evidence is sparse. The key confirmed facts are product family, vulnerable version boundary, and vulnerability class. Do not infer affected OEM devices, exploitability, remote reachability, or impact without additional vendor documentation or asset-specific testing.

Mitigation direction

  • Inventory systems using CODESYS V2 Runtime System SP and capture exact runtime versions.
  • Upgrade affected runtimes to 2.4.7.55 or later where vendor-supported.
  • Check CODESYS and device-vendor guidance before applying runtime changes.
  • Restrict network access to industrial runtime management interfaces where operationally possible.
  • Prioritize backups and rollback planning before updating production control systems.

Validation and detection

  • Confirm whether any asset runs CODESYS V2 Runtime System SP before 2.4.7.55.
  • Map affected runtimes to business-critical processes and site locations.
  • Check vendor advisories for device-specific firmware or runtime update paths.
  • Review exposure of affected systems to untrusted or routed networks.
  • Document compensating controls if immediate upgrade is not feasible.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CVE-2021-30186 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.