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Actively exploited in the wild. This CVE is on the CISA Known Exploited Vulnerabilities list — treat remediation as urgent. Federal remediation due by 8 Jan 2025.
Nvrmini FirmwareOperating system · Nuuo

CVE-2018-14933

CRITICAL · 9.8 CVSS v3.1 Published 2018-08-04
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
In the wild High EPSS Public exploit 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
upgrade_handle.php on NUUO NVRmini devices allows Remote Command Execution via shell metacharacters in the uploaddir parameter for a writeuploaddir command.

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

Command injection vulnerability in NUUO NVRmini devices allows remote attackers to execute arbitrary OS commands via shell metacharacters in the uploaddir parameter when processing the writeuploaddir command in upgrade_handle.php. The lack of input sanitization enables unauthenticated remote code execution.

MitigationApply vendor firmware patch if available; if no patch exists, isolate device on restricted network segment and implement web application firewall rules to block suspicious patterns in uploaddir parameter.

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
Nvrmini FirmwareOperating system
Affected:= 2016

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
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 checks

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

  1. Confirm device is NUUO NVRmini
    Access the device web interface or check HTTP response headers for NUUO NVRmini branding, or probe for NVRmini-specific paths like /login.php and look for NUUO signatures in the HTML
    Affected if The device is a NUUO NVRmini unit
  2. Check firmware version
    Navigate to the system information or firmware version page in the NVRmini web interface, or retrieve /bin/version or similar diagnostic endpoint if available
    Affected if Firmware version is 2016
  3. Verify upgrade_handle.php is accessible
    Attempt to access upgrade_handle.php via HTTP (e.g., GET /upgrade_handle.php) and confirm the file exists and responds
    Affected if The PHP file is present and reachable over the network
  4. Confirm writeuploaddir command handling exists
    Check if the upgrade_handle.php accepts the writeuploaddir command parameter, typically by examining if the file processes the 'command' or 'action' parameter for writeuploaddir
    Affected if The writeuploaddir command handler is implemented in the accessible PHP file
  5. Check network exposure
    Determine if the device web interface is directly accessible from untrusted networks by reviewing firewall rules or network configuration
    Affected if The NVRmini administrative interface is exposed to network segments containing untrusted users

If the device is a NUUO NVRmini running firmware version 2016 with the upgrade_handle.php accessible and the web interface exposed to untrusted networks, the environment is affected by this command injection vulnerability.

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

Apply vendor firmware patch if available; if no patch exists, isolate device on restricted network segment and implement web application firewall rules to block suspicious patterns in uploaddir parameter.

Recommended fix Moderate confidence
  1. Isolate the affected NUUO NVRmini device from untrusted networks by placing it behind a firewall with strict inbound access controls.
  2. If the device is accessible from the internet, block external access to the device's web interface (ports 80/443) at the network perimeter.
  3. Disable or restrict the upgrade_handle.php functionality if possible through the device's administrative interface.
  4. Implement network segmentation to place the NVR device in an isolated VLAN with minimal trust requirements.
  5. Monitor the device for signs of compromise and review logs for any suspicious requests to upgrade_handle.php.
  6. Consider replacing the NUUO NVRmini with a currently-supported NVR solution from a vendor that provides regular security updates.
  7. If continued use is required, contact NUUO directly to inquire about any available firmware updates or security patches for this vulnerability.

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

Fix this in Nvrmini Firmware Exploited in the wild — priority engagement
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
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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-2018-14933 in production — separate from our analysis above.

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What this is

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.

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