CVE-2013-5741
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 · uneditedTriangle Research International (aka Tri) Nano-10 PLC devices with firmware r81 and earlier do not properly handle large length values in MODBUS data, which allows remote attackers to cause a denial of service (transition to the interrupt state) via a crafted packet to TCP port 502.
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 confidenceTriangle Research International Nano-10 PLC devices with firmware r81 and earlier contain a vulnerability in the MODBUS protocol implementation where large length values in MODBUS data are not properly validated, allowing remote attackers to send crafted packets to TCP port 502 that cause the device to transition to an interrupt state and become unavailable.
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<= r81= r80all versionsCVSS 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
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Complete
AV:N/AC:L/Au:N/C:N/I:N/A:C
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 the device modelQuery the device or check device documentation to confirm it is a Triangle Research International Nano-10 PLC. This may be done via MODBUS device identification, web interface, or physical device labeling.Affected if The device is not a Triangle Research International Nano-10 PLC, then it is not affected by this specific CVE.
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Determine the installed firmware versionAccess the device through its management interface (web console, serial console, or MODBUS protocol) and retrieve the firmware version string. Compare it against the affected versions r81 and earlier, including r80.Affected if The firmware version is r81 or earlier (including r80), the device is within the affected version range.
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Check if MODBUS TCP is enabledScan the device or check its configuration to determine if the MODBUS TCP protocol is enabled. This typically involves checking if TCP port 502 is open and listening on the device.Affected if MODBUS TCP is not enabled or port 502 is not open, the attack surface may not be present.
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Verify network accessibility of port 502Determine if TCP port 502 is reachable from network segments that contain untrusted or unauthorized systems. This can be done via port scanning from various network locations.Affected if Port 502 is exposed to unauthorized or untrusted network segments, the device is vulnerable to remote exploitation.
A user is affected if they have a Triangle Research International Nano-10 PLC with firmware r81 or earlier, with MODBUS TCP (port 502) enabled and accessible from their 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 dataIsolate affected PLCs behind firewalls or network segmentation to limit MODBUS TCP (port 502) access to authorized hosts only; if available, apply vendor firmware updates to address the improper length validation, or implement intrusion detection monitoring for anomalous MODBUS traffic patterns.
- 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-2013-5741 — 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-2013-5741 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
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