CVE-2021-44435
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 · uneditedA vulnerability has been identified in JT Utilities (All versions < V13.1.1.0), JTTK (All versions < V11.1.1.0). JTTK library in affected products is vulnerable to stack based buffer overflow while parsing specially crafted JT files. An attacker could leverage this vulnerability to execute code in the context of the current process. (ZDI-CAN-14903)
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 · high confidenceThe JTTK library contains a stack-based buffer overflow vulnerability when parsing specially crafted JT files. An attacker can exploit this by providing a maliciously constructed JT file that overflows a stack-allocated buffer, potentially allowing arbitrary code execution in the context of the current process.
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< 11.1.1.0< 13.1.1.0CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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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Check Jt Open Toolkit versionLocate the JtOpenToolkit DLL or JAR file (typically named jtopen*.dll or jtopen*.jar) in the installation directory or application runtime path. Right-click the file, select Properties, and view the Version or Product Information field to determine the installed version number.Affected if The displayed version is earlier than 11.1.1.0
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Check JT Utilities versionLocate the JT Utilities installation directory (often under Siemens or PLM Software installation folders). Look for a version file, about dialog, or the main executable (often named JtUtils.exe or similar). Check the version property of the executable or any version.txt/readme file present.Affected if The displayed version is earlier than 13.1.1.0
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Identify applications using JTTK librariesSearch the system for applications that bundle or reference the Siemens Jt Open Toolkit. Check application manifests, dependencies, or search for 'Siemens JT' in installed program information. Review any CAD or PLM applications that may incorporate this toolkit.Affected if An application using JTTK is installed and processes JT files from external or untrusted sources
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Verify JT file processing exposureReview configuration or workflow where JT files are opened, imported, or processed. Check if there are any file upload features, automated file processing, or integration points where untrusted JT files could be ingested by the vulnerable libraries.Affected if The environment allows opening, importing, or processing JT files from untrusted or external sources without prior validation
You are affected if JT Utilities is earlier than 13.1.1.0 or Jt Open Toolkit is earlier than 11.1.1.0 AND the software processes JT files from untrusted sources.
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.
dbcve · scoped11.1.1.013.1.1.0
Upgrade JT Utilities to version V13.1.1.0 or later and JTTK to version V11.1.1.0 or later. Until patches are applied, avoid opening JT files from untrusted sources.
Jt Open Toolkit (JTTK) >= 11.1.1.0, JT Utilities >= 13.1.1.0
- Identify which Jt product(s) are in use: Jt Open Toolkit (JTTK) and/or JT Utilities
- For Jt Open Toolkit (JTTK): upgrade to version 11.1.1.0 or later
- For JT Utilities: upgrade to version 13.1.1.0 or later
- After upgrading, recompile and redeploy any applications that link against the JTTK library
- Test the updated application with JT files to verify the vulnerability is remediated
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-44435 — 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-2021-44435 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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- Version or environment caveats, and links to real fixes
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