Debian LinuxOperating system · Debian
CVE-2018-12086
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 · uneditedBuffer overflow in OPC UA applications allows remote attackers to trigger a stack overflow with carefully structured requests.
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 buffer overflow vulnerability in OPC UA (Open Platform Communications Unified Architecture) applications allows remote attackers to trigger a stack overflow by sending carefully structured requests. The vulnerability results from insufficient bounds checking when processing OPC UA protocol messages, potentially enabling arbitrary code execution or denial of service 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
Debian LinuxOperating system
= 9.0<= 1.03.342<= 1.03.343<= 1.03.352.12<= 1.03.340CVSS 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:3.0/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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Check if running Debian 9.0Run 'cat /etc/debian_version' or 'lsb_release -a' to identify the Debian release versionAffected if Version shows 9.0 exactly and OPC UA software is installed
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Identify OPC UA .NET Legacy versionCheck installed package version via NuGet (nuget list OPCFoundation.Net) or inspect the referenced DLL version (OPCFoundation.Opc.Ua.dll) in the application bin directoryAffected if Version is 1.03.342 or lower
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Identify OPC UA Java versionCheck the JAR file version (OPCUA-*.jar) in the application lib directory, or inspect the MANIFEST.MF file within the opc-ua-common jar for Implementation-VersionAffected if Version is 1.03.343 or lower
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Identify OPC UA .NET Standard versionCheck NuGet package version (OPCFoundation.Net.Opc.Ua) or inspect the referenced DLL version in the deployed applicationAffected if Version is 1.03.352.12 or lower
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Identify OPC UA ANSI C versionCheck the compiled binary version or inspect the header files (uatypes.h, uastatuscodes.h) for the version constant, or run 'opcua --version' if a CLI tool existsAffected if Version is 1.03.340 or lower
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Verify OPC UA service exposureCheck network listener configuration (config files or running process netstat -anp | grep ':4840' or other OPC UA ports) to determine if the service accepts remote connectionsAffected if OPC UA service is listening on a network interface accessible from untrusted networks
You are affected if any OPC UA implementation with a version at or below the affected thresholds is running and exposed on the network.
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.
From vendor dataIdentify all OPC UA implementations and dependencies in the environment, apply vendor-supplied patches, implement network segmentation to restrict exposure to untrusted networks, and validate OPC UA message sizes before processing.
Fix this in Debian Linux
Scoped from the published advisory
- 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-2018-12086 — 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-2018-12086 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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