CVE-2021-27639
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedSAP 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceSAP 3D Visual Enterprise Viewer version 9 contains an improper input validation vulnerability when parsing JT files. An attacker can craft a malicious JT file that, when opened by a user, causes the application to crash and become temporarily unavailable until the application is restarted.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 9CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify SAP 3D Visual Enterprise Viewer is installedCheck for the application in the program files directory (typically C:\Program Files\SAP\ or C:\Program Files (x86)\SAP\) or look for the application in Add/Remove Programs on WindowsAffected if The application is installed on the system
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Confirm installed version is 9Right-click on the executable (Viewer.exe) in the installation directory, select Properties, and check the File Version in the Details tab, or run: dir "C:\Program Files\SAP\3D Visual Enterprise Viewer\Viewer.exe"Affected if The File Version shows exactly 9.0.x or version 9 (the affected version)
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Identify JT file handling capabilityCheck if the application has JT file associations or if users commonly import/open JT files. Look for .jt file type associations in Windows Registry under HKEY_CLASSES_ROOT\.jt or check if JT files are present in user-accessible directoriesAffected if JT files can be opened or imported into the viewer
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Assess user exposure to JT filesSearch for .jt files on the system using: dir /s /b C:\*.jt (or relevant data directories). Check if users receive JT files from external sources or collaborate on JT-based 3D modelsAffected if Users routinely open JT files from external or untrusted sources
You are affected if SAP 3D Visual Enterprise Viewer version 9 is installed and users can open or process JT files with it.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply the SAP security patch for CVE-2021-27639 when available, and implement user training to avoid opening JT files from untrusted sources.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27639 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-27639 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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