CVE-2026-52197: UTT nv518G Denial-of-Service Vulnerability in gohead Component

Technical summary

CVE-2026-52197 is a denial-of-service vulnerability affecting UTT nv518G nv518GV3v3.2.7-210919-161313. The flaw resides in the gohead/sub_44af70 component, which handles HTTP requests. An unauthenticated remote attacker can trigger uncontrolled resource consumption (CWE-400) by sending malformed or excessive requests, exhausting system resources and rendering the device unavailable. The vulnerability requires only network connectivity and does not demand user interaction or elevated privileges. The CVSS 3.1 score of 7.5 (HIGH) reflects the network-based attack vector, low complexity, and high impact to availability.

Business impact

Organizations using affected UTT nv518G devices in production environments face risk of service interruption. Since no authentication is required and exploitation is straightforward, any external attacker can disrupt connectivity or functionality of dependent systems. For businesses relying on this hardware for critical network operations, emergency response and device recovery could consume significant operational overhead. The lack of KEV designation does not indicate low severity; rather, widespread exploitation may not yet be documented in public exploit repositories.

Affected systems

The vulnerability specifically affects UTT nv518G nv518GV3 running firmware version 3.2.7-210919-161313. Organizations should inventory devices running this exact firmware version. Verify your device model and build date against the provided version string to confirm exposure. Devices on different firmware versions or alternative UTT models require vendor confirmation of scope before assuming protection.

Exploitability

Exploitation is straightforward: an attacker positioned on the network or internet can craft HTTP requests targeting the vulnerable gohead component without credentials, user interaction, or advanced capabilities. The low complexity and absence of preconditions mean this vulnerability is likely to be actively exploited once public details are disclosed or proof-of-concept code emerges. The HIGH CVSS score accurately reflects this accessibility and the guaranteed availability impact.

Remediation

Contact UTT technical support to obtain a firmware update addressing the gohead component flaw. Verify the patched version number against the vendor's security advisory before deployment. As an interim measure, restrict network access to the device's web interface using firewall rules or network segmentation, allowing only trusted management traffic. If the device is internet-facing, temporarily disable or restrict HTTP/HTTPS access until patching is feasible.

Patch guidance

Verify the latest firmware version available from UTT for the nv518G nv518GV3 line through the vendor's official advisory or support portal. Test the patched firmware in a non-production environment before rollout. Confirm that the new version resolves the gohead/sub_44af70 issue and does not introduce regressions. Document the original firmware version (3.2.7-210919-161313) in your change log and establish a post-patch verification process to confirm availability restoration.

Detection guidance

Monitor network logs and device metrics for unusual HTTP request patterns targeting the gohead component—specifically, high volumes of malformed requests, incomplete HTTP headers, or requests with extreme payload sizes. Watch for device CPU or memory spikes correlating with unusual traffic. Implement network-based intrusion detection rules to flag requests to the vulnerable path if the vendor or security community publishes signatures. Enable device logging at maximum verbosity if supported, and archive logs for forensic analysis if an outage occurs.

Why prioritize this

This vulnerability merits urgent attention despite the absence of KEV status. The combination of unauthenticated remote access, ease of exploitation, and guaranteed denial-of-service impact poses immediate risk. Any organization operating this exact firmware version should prioritize patching or mitigation within days, not weeks. The simplicity of attack execution means widespread exploitation is probable once exploit details circulate in underground forums or security tool repositories.

Risk score, explained

The CVSS 3.1 score of 7.5 (HIGH) is justified by a network-adjacent attack vector (AV:N), low attack complexity (AC:L), no privilege requirements (PR:N), and no user interaction (UI:N). Availability impact is high (A:H), while confidentiality and integrity remain unaffected. This scoring correctly prioritizes the flaw as a significant availability risk suitable for rapid remediation in most operational contexts.

Frequently asked questions