CVE-2023-43755
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 · uneditedZavio CF7500, CF7300, CF7201, CF7501, CB3211, CB3212, CB5220, CB6231, B8520, B8220, and CD321 IP Cameras with firmware version M2.1.6.05 are vulnerable to multiple instances of stack-based overflows. During the processing and parsing of certain fields in XML elements from incoming network requests, the product does not sufficiently check or validate allocated buffer size. This may lead to remote 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 confidenceMultiple Zavio IP camera models (CF7500, CF7300, CF7201, CF7501, CB3211, CB3212, CB5220, CB6231, B8520, B8220, CD321) with firmware M2.1.6.05 contain stack-based buffer overflow vulnerabilities. The cameras insufficiently validate buffer sizes when parsing XML elements from incoming network requests, allowing remote attackers to overflow stack buffers and achieve remote code execution.
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= m2.1.6.05= m2.1.6.05= m2.1.6.05= m2.1.6.05= m2.1.6.05= m2.1.6.05= m2.1.6.05= m2.1.6.05CVSS 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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Identify Zavio camera modelAccess the camera web interface or use the manufacturer's discovery tool to confirm the exact model number. Affected models include: CF7500, CF7300, CF7201, CF7501, CB3211, CB3212, CB5220, CB6231, B8520, B8220, and CD321.Affected if The camera is one of the listed Zavio models.
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Check firmware versionLog into the camera web interface and navigate to the System or About page to view the installed firmware version. Alternatively, use the Zavio IP Finder tool or query the camera's HTTP API endpoint for firmware information.Affected if The firmware version is exactly M2.1.6.05.
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Confirm network interface is activeVerify that the camera has an active network interface and is reachable on the network. This can be done by pinging the camera IP address or checking the network status in the camera's web interface.Affected if The camera is network-accessible, which is required for the XML parsing vulnerability to be exploitable.
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Verify ONVIF or HTTP XML service is enabledCheck the camera settings to confirm that ONVIF service or HTTP/XML request handling is enabled. These services handle XML parsing and are typically enabled by default for remote management.Affected if ONVIF or HTTP XML services are enabled, allowing incoming network requests with XML content to reach the camera.
A user is affected if they have a Zavio camera from the listed models running firmware version M2.1.6.05 with network connectivity and XML-based network services enabled.
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 vendor firmware patches when available; if unavailable, isolate affected cameras on a restricted network segment and disable unnecessary network exposure to reduce attack surface.
- Consultation3.0 h
- Implementation8.0 h
- Testing4.0 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 $4,800.
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Free · runs locallyCheck whether your project pulls in CVE-2023-43755 — 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-2023-43755 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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