CVE-2021-44434
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 an out of bounds write past the end of an allocated structure while parsing specially crafted JT files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-14902, ZDI-CAN-14866)
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 confidenceOut-of-bounds write vulnerability in JTTK library's JT file parser. When parsing specially crafted JT files, the parser writes past the end of an allocated buffer, causing memory corruption that could lead to arbitrary code execution in the current process context.
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 installed JTTK versionLocate the Siemens Jt Open Toolkit installation directory and check the version information (typically in the product manifest, about dialog, or version file embedded in the toolkit DLLs/assemblies)Affected if The installed version is lower than 11.1.1.0
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Identify installed JT Utilities versionLocate the Siemens JT Utilities installation and check the version information (usually in the application properties, installer details, or executable version metadata)Affected if The installed version is lower than 13.1.1.0
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Determine if JT file parser is in useCheck whether any application or workflow in your environment uses the JTTK library to parse JT files. Review application dependencies or process command lines that invoke JT parsing tools.Affected if JT file parsing functionality is actively used in your environment
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Check for JT file processing from untrusted sourcesInspect your workflows or systems that handle JT files to determine if files from untrusted or unknown sources are being processedAffected if Your system processes JT files from untrusted or unknown sources without validation
You are affected if you have any version of JTTK below 11.1.1.0 or JT Utilities below 13.1.1.0 actively parsing JT files, particularly those 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. As a compensating control, avoid opening untrusted or unknown JT files until the patch is applied.
Jt Open Toolkit: 11.1.1.0+ | Jt Utilities: 13.1.1.0+
- Identify which product is in use: Jt Open Toolkit (JTTK) or Jt Utilities
- If using Jt Open Toolkit (JTTK), upgrade to version 11.1.1.0 or later
- If using Jt Utilities, upgrade to version 13.1.1.0 or later
- After upgrading, rebuild and redeploy any applications that use the JTTK library
- Verify that the upgraded version is correctly installed by checking the product version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation6.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA6.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-44434 — 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-2021-44434 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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