CVE-2023-24480
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 · uneditedController DoS due to stack overflow when decoding a message from the server. 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 · low confidenceStack overflow vulnerability in a controller's message decoding logic allows a malicious server to trigger a denial of service by sending specially crafted messages that exceed buffer boundaries during parsing.
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>= 501.1, <= 501.6hf8>= 510.1, <= 510.2hf12>= 511.1, <= 511.5tcu3>= 520.1, <= 520.1tcu4>= 520.2, <= 520.2tcu2CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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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Identify the device modelLocate the controller hardware or check system documentation to confirm the device is a Honeywell C300 controllerAffected if Device is not a Honeywell C300 controller - this CVE does not apply
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Determine the installed firmware versionAccess the controller's management interface or firmware management system to retrieve the current firmware version numberAffected if Cannot determine firmware version - unable to assess exposure
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Compare firmware against affected version rangesCheck if the installed version falls within any of these ranges: 501.1 to 501.6hf8, 510.1 to 510.2hf12, 511.1 to 511.5tcu3, 520.1 to 520.1tcu4, or 520.2 to 520.2tcu2Affected if Version is within any of the listed ranges - the vulnerability is present
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Assess network exposure of the message decoding interfaceReview network configuration and firewall rules to determine if untrusted servers can send messages to the controllerAffected if The controller accepts messages from untrusted network sources - exploitation is possible
You are affected if your Honeywell C300 firmware version falls within any of the listed affected ranges and the controller can receive messages from network sources that are not trusted.
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 dataApply patches or firmware updates as specified in the Honeywell Security Notification; until then, restrict network access to trusted servers.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,888.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-24480 — 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-2023-24480 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
- No spam, self-promotion, credentials, or personal data