CVE-2021-44440
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 memory corruption condition while parsing specially crafted JT files. An attacker could leverage this vulnerability to execute code in the context of the current process. (ZDI-CAN-14912)
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 confidenceMemory corruption vulnerability in the JTTK library when parsing specially crafted JT files. Attackers can exploit this to execute arbitrary code in the context of the current process by enticing users to open malicious JT files.
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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Identify JTTK installation and versionLocate the Siemens Jt Open Toolkit installation directory and check the version metadata (JAR manifest, DLL properties, or product About information)Affected if The installed JTTK version is below 11.1.1.0
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Identify JT Utilities installation and versionLocate the Siemens JT Utilities installation and retrieve the version from the product information or executable metadataAffected if The installed JT Utilities version is below 13.1.1.0
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Confirm JT file parsing is enabledDetermine whether the affected system uses JTTK or JT Utilities to parse JT files, either through application integration or command-line toolsAffected if The environment processes JT files using a vulnerable version of the library
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Inspect library file versionExamine the core JTTK library files (typically named jtopen*.jar or similar) present in the installation for explicit version numbersAffected if The library version cannot be verified as 11.1.1.0 or later
If either JTTK is below version 11.1.1.0 or JT Utilities is below version 13.1.1.0 and the environment parses JT files, the system is affected by this vulnerability.
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
Update JT Utilities to V13.1.1.0 or later and JTTK to V11.1.1.0 or later. Implement file validation and sandboxing for untrusted JT files.
Jt Open Toolkit (JTTK) >= 11.1.1.0; JT Utilities >= 13.1.1.0
- Identify whether Jt Open Toolkit (JTTK) or JT Utilities is in use, and determine the current installed version
- Download the fixed version: JTTK version 11.1.1.0 or later, JT Utilities version 13.1.1.0 or later from the official Siemens cert-portal or product distribution channel
- Install the updated version following standard installation procedures
- Verify the installed version matches the fixed release (>= 11.1.1.0 for JTTK or >= 13.1.1.0 for JT Utilities)
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-44440 — 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-2021-44440 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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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.
- 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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