CVE-2024-38435
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 · uneditedUnitronics Vision PLC – CWE-703: Improper Check or Handling of Exceptional Conditions may allow denial of service
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 · moderate confidenceA denial of service vulnerability in Unitronics Vision PLCs stemming from improper handling of exceptional conditions (CWE-703). The vulnerability allows attackers to potentially cause the PLC to become unresponsive or unavailable, likely through malformed inputs or unexpected state conditions.
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< 9.9.01CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 Unitronics Vision PLC in environmentLocate PLC hardware or review asset inventory for Unitronics Vision series controllers (V120, V130, V200, V230, V280, V350, V430, V560, etc.)Affected if Unitronics Vision PLC is present and accessible on the network
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Locate Visilogic software installationCheck installed programs on engineering workstations for Unitronics Visilogic. Common paths: C:\Program Files\Unitronics\Visilogic\ or C:\Program Files (x86)\Unitronics\Visilogic\Affected if Visilogic programming software is installed on any workstation
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Determine installed Visilogic versionOpen Visilogic and navigate to Help > About, or right-click Visilogic.exe in the installation folder and select Properties > Details to view the File VersionAffected if Installed version is lower than 9.9.01 (e.g., 9.8.x, 9.7.x, etc.)
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Verify PLC is network-accessibleConfirm the PLC has an active IP address on the network and is reachable via ping or remote access tools used for industrial systemsAffected if PLC is network-accessible without proper segmentation or firewall controls
User is affected if a Unitronics Vision PLC is in use and Visilogic version is below 9.9.01, with the PLC accessible on the network where malformed inputs could reach it.
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 · scoped9.9.01
Apply available Unitronics firmware updates when released; implement network segmentation and firewall controls to restrict unauthorized access to the PLC; monitor for vendor security advisories.
Visilogic 9.9.01 or later
- 1. Identify the current Visilogic version installed by checking About or Help > Version in the Visilogic software
- 2. If version is below 9.9.01, download the latest Visilogic version from the official Unitronics website or contact Unitronics support
- 3. Back up all existing Visilogic projects and configurations before upgrading
- 4. Install Visilogic version 9.9.01 or latest available version
- 5. Verify the upgrade by checking the version number in the software
- 6. Test PLC programs function correctly after upgrade
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-38435 — 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-2024-38435 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
- No spam, self-promotion, credentials, or personal data