CVE-2026-52192: UTT nv518G Remote Denial of Service Vulnerability

Technical summary

The vulnerability exists in the gohead/sub_445C5C component of the UTT nv518G firmware. It is classified as CWE-400 (Uncontrolled Resource Consumption), indicating the flaw allows attackers to exhaust system resources without authentication or user interaction. The attack vector is network-based with no access control requirements, making it trivial to exploit from an unauthenticated position. The resulting impact is availability loss only; confidentiality and integrity remain unaffected.

Business impact

Affected nv518G devices will become unreachable and non-functional during an active attack or as a sustained condition if the vulnerability is exploited. For organizations relying on these devices for critical network functions, this translates to operational downtime, disrupted services, and potential cascading failures in dependent systems. Recovery requires manual restart or intervention, incurring incident response overhead.

Affected systems

UTT nv518G devices with firmware version nv518GV3v3.2.7-210919-161313 are confirmed vulnerable. Organizations should verify whether they operate this specific hardware model and firmware revision in their infrastructure. Determine whether patched or alternative firmware versions are available from UTT by consulting vendor advisories directly.

Exploitability

This vulnerability requires only network access and no authentication, user interaction, or special privileges. The attack is straightforward to execute: an attacker simply sends malicious input to the gohead component to trigger resource exhaustion. The low attack complexity and absence of preconditions make exploitation reliable and practical, likely explaining the HIGH CVSS score of 7.5.

Remediation

Immediate action should focus on identifying and inventorying all nv518G devices and their firmware versions. Contact UTT directly to obtain patched firmware and deployment guidance. As an interim measure, implement network-level controls to restrict access to affected devices, limiting exposure to trusted or internal networks only. Validate any patches against vendor release notes before production deployment.

Patch guidance

Verify current firmware versions on all UTT nv518G devices. Consult UTT's official advisory channels for available patch releases and compatibility information. Apply patches in a controlled manner starting with non-critical or test systems to confirm stability. Maintain backups of device configurations before firmware updates. After patching, confirm devices are accessible and functioning normally.

Detection guidance

Monitor network traffic for unexpected requests to the gohead component on nv518G devices. Detect anomalous resource consumption or unexpected service restarts on affected hardware. Log and alert on failed attempts to access the gohead interface from unauthorized sources. Establish baseline performance metrics to identify disruptions caused by exploitation attempts.

Why prioritize this

This vulnerability rates HIGH severity due to its network exploitability, absence of authentication barriers, and guaranteed denial-of-service impact. Although it does not enable data theft or system compromise, the operational disruption is severe enough to warrant prompt remediation. Organizations with exposed nv518G devices should treat this as medium-to-high priority depending on the device's role in network operations.

Risk score, explained

The CVSS 3.1 score of 7.5 reflects a network-accessible flaw with no authentication, low complexity, and high availability impact. The score appropriately captures the ease of exploitation and operational consequence, though the absence of confidentiality or integrity loss prevents a critical rating. In environments where device availability is mission-critical, the operational risk may exceed the numerical score.

Frequently asked questions