CVE-2015-7939
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 · uneditedHeap-based buffer overflow in Unitronics VisiLogic OPLC IDE before 9.8.09 allows remote attackers to execute arbitrary code via a long vlp filename.
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 confidenceA heap-based buffer overflow vulnerability exists in Unitronics VisiLogic OPLC IDE versions prior to 9.8.09. The vulnerability is triggered when processing a specially crafted long vlp filename, causing memory corruption that can lead to arbitrary code execution by remote attackers.
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<= 9.8.0.00CVSS 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
- Required
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/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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Locate VisiLogic OPLC IDE installationCheck common installation paths such as C:\Program Files\Unitronics\VisiLogic or C:\Program Files (x86)\Unitronics\VisiLogic. Also search for the executable 'VisiLogic.exe' using file search.Affected if The software is found installed on the system
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Determine installed versionRight-click on VisiLogic.exe, select Properties, then view the Details tab to see the File Version. Alternatively, open VisiLogic and navigate to Help > About to view the version information.Affected if The version displayed is 9.8.0.00 or lower (any version prior to 9.8.09)
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Check for recent vlp file activitySearch for .vlp project files on the system using the file explorer search or command 'dir /s /b *.vlp' to identify if the user works with VisiLogic project files.Affected if The user has .vlp files present, as the vulnerability is triggered when opening specially crafted vlp filenames
The system is affected if VisiLogic OPLC IDE is installed with a version 9.8.0.00 or lower and the user opens or processes vlp project 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 · scopedUpgrade VisiLogic OPLC IDE to version 9.8.09 or later to obtain the patched software. If immediate patching is not feasible, restrict access to the IDE and exercise caution when opening vlp files from untrusted sources.
Visilogic OPLC IDE version 9.8.09 or later
- Identify the current version of Visilogic OPLC IDE installed on the system
- Navigate to the official Unitronics website or authorized distributor to obtain the updated Visilogic OPLC IDE software
- Download Visilogic OPLC IDE version 9.8.09 or later
- Close any running instances of the Visilogic OPLC IDE application
- Run the installer for version 9.8.09 or later
- Follow the on-screen prompts to complete the installation
- Verify the installed version by checking About or the version information in the application
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-7939 — 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-2015-7939 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
- No spam, self-promotion, credentials, or personal data