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Cs C6n A0 1c2wfr FirmwareOperating system · Ezviz

CVE-2023-48121

MEDIUM · 5.3 CVSS v3.1 Published 2023-11-28
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

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 · unedited
An authentication bypass vulnerability in the Direct Connection Module in Ezviz CS-C6N-xxx prior to v5.3.x build 20230401, Ezviz CS-CV310-xxx prior to v5.3.x build 20230401, Ezviz CS-C6CN-xxx prior to v5.3.x build 20230401, Ezviz CS-C3N-xxx prior to v5.3.x build 20230401 allows remote attackers to obtain sensitive information by sending crafted messages to the affected devices.

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 confidence

An authentication bypass vulnerability exists in the Direct Connection Module of Ezviz IP cameras (CS-C6N-xxx, CS-CV310-xxx, CS-C6CN-xxx, CS-C3N-xxx) prior to firmware v5.3.x build 20230401. The vulnerability allows remote unauthenticated attackers to obtain sensitive information by sending specially crafted messages to affected devices.

MitigationUpgrade Ezviz camera firmware to v5.3.x build 20230401 or later. If immediate patching is not feasible, implement network segmentation and firewall controls to restrict access to the Direct Connection Module from untrusted networks.

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
Cs C6n A0 1c2wfr FirmwareOperating system
Affected:all versions
Cs Cv310 A0 1c2wfr FirmwareOperating system
Affected:all versions
Cs C6cn A0 3h2wfr FirmwareOperating system
Affected:all versions
Cs C3n A0 3h2wfrl FirmwareOperating system
Affected:all versions

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
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the camera model
    Access the camera web interface or use the Ezviz mobile app to view device information. Confirm the model number matches one of: CS-C6N-xxx, CS-CV310-xxx, CS-C6CN-xxx, or CS-C3N-xxx.
    Affected if The model is any of the listed affected variants.
  2. Check the installed firmware version
    Navigate to the camera settings page in the web interface or mobile app, then locate the firmware version information. Compare it against v5.3.x build 20230401.
    Affected if The firmware version is below v5.3.x build 20230401, or if the version cannot be determined.
  3. Verify the Direct Connection Module is accessible
    Check the camera network settings to determine if the Direct Connection or P2P feature is enabled. This is typically found under Network or Cloud settings in the camera interface.
    Affected if The Direct Connection Module is enabled and accessible on the network.
  4. Assess network exposure of the Direct Connection Module
    Review firewall rules and network configuration to determine if the camera and its Direct Connection service are exposed to the public internet or untrusted networks.
    Affected if The Direct Connection Module is reachable from untrusted or external networks without firewall restrictions.

A user is affected if they own one of the listed camera models (CS-C6N, CS-CV310, CS-C6CN, CS-C3N) running firmware versions below v5.3.x build 20230401 and have the Direct Connection Module enabled and exposed to untrusted networks.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade Ezviz camera firmware to v5.3.x build 20230401 or later. If immediate patching is not feasible, implement network segmentation and firewall controls to restrict access to the Direct Connection Module from untrusted networks.

Recommended fix High confidence

Ezviz firmware v5.3.x build 20230401 or later for CS-C6N, CS-CV310, CS-C6CN, and CS-C3N camera models

  1. Open the Ezviz mobile app or web portal and navigate to the device settings for the affected camera (CS-C6N, CS-CV310, CS-C6CN, or CS-C3N)
  2. Locate the 'Firmware Update' or 'Device Info' section in the device settings
  3. Check the current firmware version - if it is earlier than v5.3.x build 20230401, the device is vulnerable
  4. If an update is available, download and install the firmware update (v5.3.x build 20230401 or later) through the Ezviz app or official Ezviz website
  5. After the update completes, verify the new firmware version confirms v5.3.x build 20230401 or newer is installed
  6. Alternatively, download the firmware manually from the official Ezviz support site (www.ezviz.com) for the specific model and upload it through the device settings
Caveat Review Ezviz release notes for v5.3.x to check for any feature changes or compatibility issues before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Cs C6n A0 1c2wfr Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-48121 in production — separate from our analysis above.

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What this is

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What belongs here
  • 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