CVE-2025-46613
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 · uneditedOpenPLC 3 through 64f9c11 has server.cpp Memory Corruption because a thread may access handleConnections arguments after the parent stack frame becomes unavailable.
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 confidenceOpenPLC 3 contains a memory corruption vulnerability in server.cpp where a thread accesses handleConnections function arguments after the parent function's stack frame has become unavailable. This creates a use-after-return condition leading to memory corruption and potential arbitrary code execution.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- Low
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/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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Confirm OpenPLC installation and locate server.cppSearch for the OpenPLC installation directory and the server.cpp file (typically in the WebServer or core component). Run: find / -name 'server.cpp' 2>/dev/null | xargs grep -l 'handleConnections'Affected if server.cpp with handleConnections function is found in the OpenPLC installation directory
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Identify OpenPLC versionCheck for version files, README, or git tags in the OpenPLC directory. Run: cat INSTALL_PATH/README | head -20 or check for version.h, or run openplc --version if availableAffected if OpenPLC version cannot be determined or is within the 3.x release family prior to the fix
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Examine thread argument handling in handleConnections callOpen server.cpp and locate where pthread_create or similar threading call invokes handleConnections. Check if arguments are passed as pointers to local/stack variablesAffected if Thread arguments reference stack-allocated variables (local to the calling function) rather than heap-allocated or static storage
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Verify use-after-return code patternReview the handleConnections function signature and its usage. Look for: void* handleConnections(void* arg) being called with &localVariable as the argument, where localVariable is a stack variable that will go out of scopeAffected if The thread receives a pointer to a stack variable from the parent function's scope, creating a use-after-return condition when the parent function returns
You are affected if OpenPLC 3 is running with the vulnerable server.cpp code pattern where thread arguments reference stack variables instead of heap/static storage, leading to use-after-return when the parent function exits.
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 dataFix the threading model in server.cpp to ensure thread arguments are properly allocated (heap or static storage) rather than referencing stack variables that become invalid when the parent function returns.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-46613 — 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-2025-46613 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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- Version or environment caveats, and links to real fixes
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