External risk intelligence

NUUO NVR Firmware Access Control Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2022-25521

This product is a Network Video Recorder (NVR) firmware. NVRs and similar video surveillance management appliances are commonly deployed as internet-facing or remote-accessible gateways to allow for off-site monitoring and management, making their administrative and access control interfaces frequently reachable from the public internet.

Nuuo Network Video Recorder Firmware

1.0 and earlier

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

NUUO NVR firmware has a critical access control vulnerability that could allow unauthorized remote access. The main concern is confirming relevance and exposure within your environment.

Default credentials allow unauthorized remote access.
Critical flaw enables widespread unauthorized access.
Confirm NUUO NVR firmware exposure.

Attack Path

How an attacker could exploit the issue

An attacker could potentially reach the vulnerable NUUO Network Video Recorder firmware through the network, as it appears to be internet-facing. The vulnerability stems from an access control issue that, when triggered, could allow an attacker to gain unauthorized remote access. This could lead to a compromise of the system's confidentiality, integrity, and availability.

Accessible over the network.
Triggered by an access control flaw.
Risk of unauthorized remote access.

Live Threat

Current exploitation, exposure, and threat context

An access control issue in NUUO firmware could allow unauthenticated users to access sensitive system data and potentially alter service behavior. This could occur when the NUUO Network Video Recorder firmware is exposed to the network.

System data and service control.
Unauthenticated remote access.
Unauthorized system modification.

Operational Fix

Recommended remediation, mitigation, and detection steps

The NUUO Network Video Recorder firmware is likely managed by the infrastructure or platform team responsible for network appliances. The first step is to identify all instances of this firmware, determine their exposure (internal/external), assess business criticality, and locate the accountable system owner before planning any remediation.

Identify affected NVR firmware instances.
Verify external accessibility and business criticality.
Plan remediation with accountable system owners.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is NUUO network video recorder firmware?

NUUO network video recorder firmware is the underlying operating software for NUUO's digital surveillance appliances. These devices are used to manage, record, and store video feeds from security cameras in both small and large-scale environments. The firmware acts as the central hub that connects cameras, manages storage, and provides the administrative interface used to view live footage or adjust security configurations.

What does CWE-798 mean for CVE-2022-25521?

CWE-798 refers to the use of hard-coded or default credentials. In the context of CVE-2022-25521, this means the system likely contains pre-set usernames or passwords that cannot be easily changed or are widely known. Because these credentials are built into the software, an attacker does not need to guess a password or bypass complex security barriers; they simply use the default information to gain unauthorized access to the device's administrative functions.

How is this NUUO vulnerability triggered?

The vulnerability is triggered when an attacker attempts to log in to the NUUO device using the hard-coded or default credentials. It does not require special administrative privileges or complex exploit code; simple network connectivity to the device's interface is sufficient. Conversely, the bug is not triggered if the device is not accessible over the network or if the specific default credentials associated with this flaw are not in use on a particular system.

Why should I care about this NVR vulnerability?

Halo Surface Signal notes that NUUO NVRs are frequently deployed as internet-facing gateways to facilitate remote monitoring, which significantly increases the risk. If your NVR is reachable from the public internet, anyone with knowledge of the default credentials could potentially view your private security footage, modify your surveillance settings, or interfere with system availability, regardless of your internal physical security measures.

What should I do if I run NUUO NVR hardware?

Start by identifying all NUUO NVR units in your environment and confirming whether they are connected to the public internet. Locate the system owner responsible for managing these appliances and verify their current accessibility. Since this issue involves default credentials, the primary goal is to restrict network access to these devices immediately while you work with the manufacturer or your infrastructure team to implement secure credential management.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.