CVE-2026-52193 Overview
CVE-2026-52193 is a buffer overflow vulnerability affecting the UTT nv518G router running firmware version nv518GV3v3.2.7-210919-161313. The flaw resides in the gohead/sub_447CAC component and can be triggered remotely without authentication or user interaction. Successful exploitation allows an unauthenticated attacker to cause a denial of service against the affected device. The weakness is classified under CWE-120, Buffer Copy without Checking Size of Input.
Critical Impact
A remote, unauthenticated attacker can crash the UTT nv518G router by sending crafted input to the vulnerable gohead/sub_447CAC handler, disrupting network availability for all downstream clients.
Affected Products
- UTT nv518G router, firmware nv518GV3v3.2.7-210919-161313
- Vulnerable component: gohead/sub_447CAC
- Firmware distributed via the UTT Download Center
Discovery Timeline
- 2026-06-30 - CVE-2026-52193 published to NVD
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-52193
Vulnerability Analysis
The vulnerability exists in the gohead web management service embedded in the UTT nv518G firmware. Specifically, the routine identified at address sub_447CAC copies attacker-controlled input into a fixed-size buffer without validating the input length. When the copy operation exceeds the destination buffer, adjacent stack or heap memory is corrupted, leading to a crash of the gohead process. Because gohead handles the router's web-based administration interface, its termination results in loss of management access and, depending on the process supervision model, wider network service disruption. The impact is limited to availability. Confidentiality and integrity are not affected according to the published CVSS vector.
Root Cause
The root cause is missing bounds checking on request data processed by the sub_447CAC function inside gohead. The function trusts the length of incoming data supplied through the HTTP interface and performs an unchecked memory copy, matching the pattern described by CWE-120.
Attack Vector
An attacker reaches the vulnerable code path over the network by sending a crafted HTTP request to the router's web management interface. No credentials are required, and no user interaction is needed. Repeated requests can keep the device in a denial-of-service state. Technical analysis and reproduction notes are available in the GitHub CVE Report Repository.
Detection Methods for CVE-2026-52193
Indicators of Compromise
- Unexpected restarts or crashes of the gohead web management process on UTT nv518G devices.
- Loss of HTTP/HTTPS reachability to the router administration interface following inbound requests from untrusted sources.
- Malformed or oversized HTTP requests targeting URIs handled by sub_447CAC in device logs.
Detection Strategies
- Inspect network traffic destined for the router's management interface for abnormally long parameter values or malformed HTTP requests.
- Correlate device availability alerts with inbound WAN-side requests to the management port.
- Monitor SNMP or syslog output from the router for repeated service restarts.
Monitoring Recommendations
- Alert on any external source attempting to reach the UTT nv518G administration interface.
- Track uptime and process health metrics for the gohead service and generate alerts on unexpected restarts.
- Ingest router logs into a centralized log platform to retain forensic evidence of exploitation attempts.
How to Mitigate CVE-2026-52193
Immediate Actions Required
- Restrict access to the UTT nv518G web management interface to trusted management networks only, and block WAN-side exposure at the perimeter.
- Disable remote administration on the WAN interface if it is not required for operations.
- Monitor the UTT Download Center for a firmware update addressing this issue.
Patch Information
No vendor patch has been referenced in the NVD entry at the time of publication. Administrators should track the UTT Download Center for updated firmware beyond nv518GV3v3.2.7-210919-161313 and apply it as soon as it becomes available.
Workarounds
- Place the router behind an upstream firewall and permit management access only from specific administrative IP addresses.
- Terminate management sessions on a VPN that fronts the device rather than exposing gohead directly.
- Where feasible, replace or retire affected UTT nv518G units until a fixed firmware release is available.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
