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Jt Open ToolkitApplication · Siemens

CVE-2021-44445

HIGH · 7.8 CVSS v3.1 Published 2021-12-14
Fix available
A fix is available. Upgrade to 11.1.1.0 / 13.1.1.0 or later.
See remediation →
81/100
Remediation priority · High
No privileges

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 · unedited
A 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 contains an out of bounds write past the fixed-length heap-based buffer while parsing specially crafted JT files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-15054)

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 confidence

Heap-based buffer overflow vulnerability in JTTK library when parsing specially crafted JT files. The parser writes beyond the bounds of a fixed-length heap buffer during file parsing, potentially allowing arbitrary code execution in the context of the current process.

MitigationUpgrade JTTK to version 11.1.1.0 or later and JT Utilities to version 13.1.1.0 or later. Avoid opening untrusted JT files from unknown sources until patches are applied.

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
Jt Open ToolkitApplication
Affected:< 11.1.1.0
Jt UtilitiesApplication
Affected:< 13.1.1.0

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Locate the JT Open Toolkit installation directory
    Search for 'jtopen' or 'JTTK' in common installation paths such as C:\Program Files\Siemens or /opt/siemens, or check the software inventory provided by your system's package manager
    Affected if The JT Open Toolkit software is found on the system
  2. Identify the installed version of Siemens JT Open Toolkit
    Right-click the jtopen.jar or jtopen.dll file, select Properties, and check the Version tab; alternatively, run 'java -jar jtopen.jar -version' if the toolkit includes a CLI launcher
    Affected if The version number displayed is less than 11.1.1.0
  3. Locate the JT Utilities installation directory
    Search for 'JTUtilities' or 'Siemens JT Utilities' in the system, commonly under C:\Program Files\Siemens or within the Siemens installation folder
    Affected if The JT Utilities software is found on the system
  4. Identify the installed version of Siemens JT Utilities
    Right-click the main executable or DLL (such as JTUtilties.exe), select Properties, and check the File Version; or check the version listed in Add/Remove Programs
    Affected if The version number displayed is less than 13.1.1.0

The environment is affected if either Siemens JT Open Toolkit version is below 11.1.1.0 or Siemens JT Utilities version is below 13.1.1.0.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 11.1.1.0 / 13.1.1.0 or later
Fixed in 11.1.1.013.1.1.0
Interim mitigation

Upgrade JTTK to version 11.1.1.0 or later and JT Utilities to version 13.1.1.0 or later. Avoid opening untrusted JT files from unknown sources until patches are applied.

Recommended fix Moderate confidence

Jt Open Toolkit (JTTK) >= 11.1.1.0 and JT Utilities >= V13.1.1.0

  1. 1. Identify all installations of Jt Open Toolkit (JTTK) in your environment that are version < 11.1.1.0
  2. 2. Identify all installations of JT Utilities in your environment that are version < V13.1.1.0
  3. 3. Obtain the fixed versions: JTTK 11.1.1.0 or later, JT Utilities V13.1.1.0 or later from Siemens (cert-portal.siemens.com)
  4. 4. Before deploying, test the fixed versions in a non-production environment to verify compatibility with your JT file processing workflows
  5. 5. Deploy the upgraded versions to production systems
  6. 6. Validate that JT file parsing functionality works correctly after the upgrade
  7. 7. Continue to monitor Siemens security advisories for future updates

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Jt Open Toolkit Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-44445 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data