CVE-2021-44443
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 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-15039)
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 confidenceJTTK library contains an out-of-bounds write vulnerability when parsing JT files. The vulnerability allows writing past the end of an allocated memory structure, which can be triggered by specially crafted malicious JT files and may lead to 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.
-
Identify if JTTK or JT Utilities are installedLook for Siemens Jt Open Toolkit or JT Utilities software on the system. Check common installation directories such as C:\Program Files\Siemens or use system inventory tools to list installed software.Affected if Either Siemens Jt Open Toolkit or JT Utilities is present on the system
-
Determine the installed version of Jt Open ToolkitLocate the JTTK installation and check the version information. Common methods include: right-clicking the executable and selecting Properties > Details, or checking version info in the software's about dialog or readme file.Affected if The version is less than 11.1.1.0
-
Determine the installed version of JT UtilitiesLocate the JT Utilities installation and check the version information. Common methods include: right-clicking the executable and selecting Properties > Details, or checking version info in the software's about dialog or readme file.Affected if The version is less than 13.1.1.0
-
Determine if the software processes JT files from untrusted sourcesReview how the software is used in your environment. Identify if it is configured to open, parse, or process JT files from external or untrusted sources.Affected if The software is used to parse JT files and the installed version falls within the affected ranges
You are affected if Siemens Jt Open Toolkit version < 11.1.1.0 or JT Utilities version < 13.1.1.0 is installed and the software is used to parse JT files.
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 and JT Utilities to version >= 13.1.1.0. Until patches are applied, avoid opening JT files from untrusted sources.
Jt Open Toolkit 11.1.1.0+ | Jt Utilities 13.1.1.0+
- 1. Identify all deployments of Jt Open Toolkit (JTTK) in your environment
- 2. Upgrade Jt Open Toolkit to version 11.1.1.0 or later
- 3. Identify all deployments of Jt Utilities in your environment
- 4. Upgrade Jt Utilities to version 13.1.1.0 or later
- 5. Verify the installed versions match or exceed the fixed releases
- 6. Re-scan or re-test any JT file processing to confirm the vulnerability is remediated
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,904.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-44443 — 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-2021-44443 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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
- No spam, self-promotion, credentials, or personal data