CVE-2023-5394
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 · uneditedServer receiving a malformed message that where the GCL message hostname may be too large which may cause a stack overflow; resulting in possible remote code execution. Honeywell recommends updating to the most recent version of the product. See Honeywell Security Notification for recommendations on upgrading and versioning.
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 confidenceStack-based buffer overflow vulnerability in Honeywell security products where a malformed GCL message containing an oversized hostname field causes a stack overflow, potentially allowing remote 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
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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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Identify the Honeywell security productLocate the model number and firmware version of the Honeywell security device. This is typically found on the device label, in the web interface under 'About' or 'System Info', or via the device's administrative console.Affected if The device is a Honeywell security product and the firmware version predates the security patch for CVE-2023-5394.
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Verify GCL message processing is enabledCheck the device configuration for GCL (Grandstream Configuration Language or similar protocol) message handling settings. This may be in network settings, remote management, or integration settings depending on the product.Affected if GCL message processing is enabled and the device accepts incoming GCL messages from network sources.
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Inspect the hostname configurationAccess the device network settings and examine the configured hostname field. Look for any hostname entries that appear unusually long or contain unexpected characters.Affected if The hostname field is configured with a value longer than typical limits or was recently modified to an unusually large size.
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Review system logs for crash evidenceExamine the device logs or syslog exports for entries indicating unexpected restarts, stack faults, or memory errors, particularly when GCL messages are processed.Affected if Logs show crashes, stack overflow errors, or unexpected reboots coinciding with GCL message activity.
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Compare against vendor advisory versionsCheck the Honeywell Security Notification for this CVE to obtain the list of patched versions, then compare your installed firmware version against those recommendations.Affected if Your firmware version is older than the patched version listed in the Honeywell advisory for this CVE.
The environment is likely affected if it is a Honeywell security product running firmware that accepts GCL messages and has not been updated to the patched version specified in the Honeywell security notification for CVE-2023-5394.
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 to the most recent version of the product following the recommendations in the Honeywell Security Notification.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 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 $2,512.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-5394 — 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-2023-5394 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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