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CVE Record

CVE-2021-20094: A denial of service vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a.

A denial of service vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An unauthenticated remote attacker can exploit this issue to crash the CodeMeter Runtime Server.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-20094 can let an unauthenticated remote attacker crash Wibu-Systems CodeMeter Runtime Server on versions before 7.21a. The main business risk is service disruption for software licensing or systems that depend on CodeMeter, including environments covered by Siemens and CISA ICS advisories.

Executive priority

Treat this as an availability risk, not a confirmed breach risk. Prioritize remediation where CodeMeter supports production, licensing, or industrial operations, because a crash could interrupt dependent services.

Technical view

The provided sources describe a remotely reachable denial-of-service flaw in Wibu-Systems CodeMeter Runtime Server before 7.21a. No CVSS vector, CWE, or detailed root cause is included in the bundle. The stated impact is a crash of the runtime server, not code execution or data compromise.

Likely exposure

Exposure is likely where CodeMeter Runtime Server before 7.21a is installed, especially on hosts reachable from untrusted networks or supporting operational technology products referenced by vendor advisories.

Exploitation context

The bundle says exploitation is unauthenticated and remote, but it does not provide evidence of active exploitation. CISA KEV status is false in the supplied data.

Researcher notes

Evidence is limited to a remote unauthenticated DoS claim and affected version boundary. The bundle does not include CVSS, CWE, root-cause detail, exploit maturity, or proof of active exploitation. Avoid assuming broader impact beyond runtime-server crash.

Mitigation direction

  • Inventory CodeMeter Runtime Server installations and versions.
  • Upgrade affected CodeMeter deployments to 7.21a or later where vendor guidance supports it.
  • Review Wibu-Systems, Siemens, and CISA ICS advisories for product-specific instructions.
  • Restrict network access to CodeMeter Runtime Server from untrusted networks.
  • Prioritize systems where CodeMeter supports operational or production-critical services.

Validation and detection

  • Confirm whether any installed CodeMeter Runtime Server version is below 7.21a.
  • Map exposed CodeMeter hosts and identify untrusted network reachability.
  • Check Siemens advisory applicability for products in your environment.
  • Review monitoring for unexpected CodeMeter Runtime Server crashes or restarts.
  • Verify post-remediation versions against vendor advisory guidance.
Prepared
Confidence
medium
Sources
6

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

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CVE-2021-20094 mapping review

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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
5Source 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/aWibu-Systems CodeMeter< 7.21aListed
Weakness

CWE details

No CWE listed

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