CVE-2021-44442
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 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-14995)
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 confidenceHeap-based buffer overflow in JTTK library during JT file parsing. The parser writes beyond the boundaries of a fixed-length heap buffer when processing specially crafted JT files, allowing 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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Check Jt Open Toolkit versionLocate the Jt Open Toolkit installation directory (commonly in Program Files/Siemens or within the application's runtime path) and check the version information in the product's about dialog, version.txt, or library manifest file. On Windows, also check Add/Remove Programs for the installed version.Affected if The installed version is lower than 11.1.1.0
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Check JT Utilities versionLocate the Siemens JT Utilities installation (typically in Program Files/Siemens/JT_Utilities or similar). Retrieve the version from the application's executable properties, version info file, or installation metadata in the Windows registry.Affected if The installed version is lower than 13.1.1.0
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Identify active JT parsing usageReview application logs, processes, or configurations that invoke the JTTK library for JT file parsing. Check for any automated batch processes, viewer applications, or data conversion tools that load jtkit.dll or similar JTTK components.Affected if The product is actively used to parse JT files with versions below the fixed releases
You are affected if either Siemens Jt Open Toolkit below 11.1.1.0 or Siemens JT Utilities below 13.1.1.0 is installed and used for JT file parsing.
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 JTTK to version 11.1.1.0 or later, and JT Utilities to version 13.1.1.0 or later to patch the vulnerable parsing code.
Jt Open Toolkit 11.1.1.0 or later; Jt Utilities 13.1.1.0 or later
- 1. Identify which affected product(s) are in use: Jt Open Toolkit (JTTK) and/or Jt Utilities
- 2. Determine current installed version of the relevant product(s)
- 3. For Jt Open Toolkit: upgrade to version 11.1.1.0 or later
- 4. For Jt Utilities: upgrade to version 13.1.1.0 or later
- 5. Verify the upgrade was successful by checking the installed version
- 6. Re-scan or re-test any systems that process JT files to confirm the vulnerability is remediated
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-44442 — 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-2021-44442 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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