CVE-2023-3959
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. While processing 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 · moderate confidenceMultiple Zavio IP camera models with firmware M2.1.6.05 contain stack-based buffer overflow vulnerabilities. The cameras fail to validate buffer sizes when processing XML elements from incoming network requests, allowing attackers to overflow the stack 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 the Zavio camera modelAccess the camera's web interface, check the device info page, or use network discovery to retrieve the model number (Cf7500, Cf7300, Cf7201, Cf7501, Cb3211, Cb3212, Cb5220, or Cb6231)Affected if The model is any of these eight affected models
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Check the installed firmware versionNavigate to the camera's admin settings, typically under System > Firmware or Device Info, and note the firmware version stringAffected if The firmware version is exactly m2.1.6.05 (no other versions are listed as affected)
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Verify the web management interface is network-accessibleAttempt to access the camera's HTTP/HTTPS interface from a network location, or check firewall rules allowing inbound traffic to the camera's web port (typically 80 or 443)Affected if The web interface is exposed to untrusted networks (the vulnerability is triggered by incoming network requests)
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Confirm ONVIF or XML-based services are enabledCheck the camera's network service settings for ONVIF, XML API, or similar features that process XML elements from network requestsAffected if These services are enabled and reachable over the network
The environment is affected only if you have a Zavio camera model Cf7500, Cf7300, Cf7201, Cf7501, Cb3211, Cb3212, Cb5220, or Cb6231 running exactly firmware version m2.1.6.05 with network-accessible management interfaces.
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 updates when available; prior to patching, restrict network access to camera management interfaces via firewall rules or VLAN segmentation to reduce attack surface.
- Consultation6.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-3959 — 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-2023-3959 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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