CVE-2023-7244
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 · uneditedIndustrial Control Systems Network Protocol Parsers (ICSNPP) - Ethercat Zeek Plugin versions d78dda6 and prior are vulnerable to out-of-bounds write in their primary analyses function for Ethercat communication packets. This could allow an attacker to cause arbitrary code execution.
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 confidenceThe ICSNPP Ethercat Zeek plugin versions d78dda6 and prior contains an out-of-bounds write vulnerability in its primary analysis function for parsing Ethercat communication packets. This memory corruption flaw in the network protocol parser could allow an attacker to achieve arbitrary code execution by sending specially crafted Ethercat packets.
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<= d78dda6CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 the ICSNPP Ethercat plugin installationSearch for the icsnpp-ethercat plugin directory in standard Zeek plugin paths such as /usr/local/zeek/lib/zeek/plugins/, /opt/zeek/lib/zeek/plugins/, or the directory where you originally installed the ICSNPP suite. If you built from source, check the source tree where the plugin was compiled.Affected if The plugin directory named icsnpp-ethercat or similar is found on the system.
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Determine the plugin versionCheck the git commit hash of the installed plugin. In the plugin source directory, run 'git rev-parse HEAD' to obtain the current commit, or inspect any version file or metadata included with the plugin package. Compare the commit hash to d78dda6.Affected if The git commit hash is d78dda6 or an earlier commit (alphabetically/chronologically before d78dda6).
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Verify Ethercat protocol analysis is activeExamine your Zeek policy scripts and configuration for the presence of loading or enabling the Ethercat analyzer. This is typically done via '@load icsnpp/ethercat' or similar in your zeekctl configuration or local.zeek file. Also check if the plugin auto-discovers Ethercat traffic.Affected if The Ethercat analyzer is loaded or enabled in your Zeek configuration and Zeek is processing Ethercat traffic on the monitored interface.
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Confirm Zeek is processing Ethercat trafficReview Zeek logs (particularly notice.log or capture logs) or run Zeek with the plugin loaded and observe if Ethercat protocol-specific logs are being generated, indicating the analyzer is actively parsing Ethercat packets.Affected if Zeek is actively parsing Ethercat packets on your monitored network segments.
You are affected if your ICSNPP Ethercat plugin is at version d78dda6 or earlier AND Ethercat protocol analysis is enabled and processing traffic.
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 dataUpgrade the ICSNPP Ethercat Zeek plugin to a version newer than d78dda6 that includes proper bounds checking in the Ethercat packet parsing logic. If upgrading is not immediately possible, restrict network access to the Zeek sensor and disable Ethercat protocol analysis until the patch can be applied.
- Consultation2.0 h
- Implementation1.0 h
- Testing4.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-7244 — 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-2023-7244 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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