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CVE Record

CVE-2021-27639: SAP 3D Visual Enterprise Viewer, version - 9, allows a user to open manipulated JT file received from untru...

SAP 3D Visual Enterprise Viewer, version - 9, allows a user to open manipulated JT file received from untrusted sources which results in crashing of the application and becoming temporarily unavailable until the user restarts the application, this is caused due to Improper Input Validation.

MediumCVSS 4.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This issue can make SAP 3D Visual Enterprise Viewer crash when a user opens a manipulated JT file from an untrusted source. The business impact is temporary loss of the viewer application until restart, not data theft or system takeover based on the provided sources.

Executive priority

Treat this as a moderate operational resilience issue. It does not indicate data compromise, but teams relying on the viewer for engineering or manufacturing workflows should validate exposure and follow SAP guidance promptly.

Technical view

CVE-2021-27639 is an improper input validation flaw in SAP 3D Visual Enterprise Viewer affecting versions below 9. The CVSS 3.0 score is 4.3, with network attack vector, low complexity, no privileges required, user interaction required, and low availability impact only.

Likely exposure

Exposure is most likely where SAP 3D Visual Enterprise Viewer is installed and users receive or open JT files from external or otherwise untrusted sources. Systems not using the viewer or not handling JT files are less likely to be exposed.

Exploitation context

The source bundle does not show CISA KEV listing or other evidence of active exploitation. Exploitation requires a user to open a manipulated JT file, and the documented outcome is application crash until restart.

Researcher notes

Evidence is limited to the CVE description, CVSS vector, affected product statement, SAP references, and non-KEV status. The weakness is described as improper input validation causing a user-triggered denial of service in the application.

Mitigation direction

  • Identify SAP 3D Visual Enterprise Viewer installations and versions.
  • Review SAP Note 3059999 for vendor-confirmed remediation guidance.
  • Apply SAP-recommended updates or workarounds after confirming applicability.
  • Limit opening JT files from untrusted sources where practical.
  • Route external JT files through established file-handling controls.

Validation and detection

  • Confirm whether deployed Viewer versions are below 9.
  • Verify users or workflows process JT files from external sources.
  • Check whether SAP Note 3059999 guidance has been reviewed and applied.
  • Review support logs for Viewer crashes associated with JT files.
  • Confirm file-handling restrictions cover untrusted JT attachments or downloads.
Prepared
Confidence
high
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

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CVE-2021-27639 mapping review

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

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.3 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

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.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
4.3CVSS 3.0MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L2.81.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

4.3Medium
CVSS 3.0 vector shape for CVE-2021-27639Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
SAP SESAP 3D Visual Enterprise Viewer< 9Listed
Weakness

CWE details

No CWE listed

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