CVE-2023-7242
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 read during the process of analyzing a specific Ethercat packet. This could allow an attacker to crash the Zeek process and leak some information in memory.
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 confidenceOut-of-bounds read vulnerability in the ICSNPP Ethercat Zeek plugin (versions d78dda6 and prior) when parsing specific Ethercat packets. This can crash the Zeek process (denial of service) and potentially leak information from memory.
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
- Low
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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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Locate the ICSNPP Ethercat plugin installationSearch for plugin files containing 'icsnpp' or 'ethercat'. Common paths include /usr/local/zeek/lib/zeek/plugins/, /opt/zeek/lib/zeek/plugins/, or the zeek plugin directory on your system. Use: find / -path '*zeek*plugins*' -name '*ethercat*' 2>/dev/nullAffected if The plugin directory or files named icsnpp-ethercat are found on the system
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Determine the installed plugin versionIf installed from source, check the git log in the plugin source directory for the commit hash. Look for a VERSION file, CHANGELOG, or metadata that indicates the version. The vulnerable version is identified by commit d78dda6 or any commit prior to it.Affected if The version/commit is d78dda6 or earlier (older commits)
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Verify Zeek is loading the Ethercat analyzerRun 'zeek -N' to list loaded plugins and analyzers. Look for 'icpnp::Ethercat' or 'Ethercat' in the output. Also check your Zeek configuration or policy files for load directives related to ethercat.Affected if The Ethercat analyzer from ICSNPP is listed as loaded in Zeek
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Confirm Zeek is processing Ethercat trafficReview your Zeek logs (particularly notice.log) or your capture configuration. Determine if Zeek is analyzing network captures or live traffic that contains Ethercat protocol packets.Affected if Zeek is actively parsing Ethercat packets from industrial network traffic
The environment is affected if the ICSNPP Ethercat plugin is installed at version d78dda6 or prior AND Zeek is actively loading and using the Ethercat analyzer to process network 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 dataUpdate the ICSNPP Ethercat Zeek plugin to a version beyond d78dda6 that contains the fix, or apply any available security patches.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-7242 — 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-2023-7242 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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