CVE-2026-52195 Overview
CVE-2026-52195 is a buffer overflow vulnerability affecting UTT nv518G firmware version nv518GV3v3.2.7-210919-161313. The flaw resides in the gohead/sub_472f08 component of the device's web management interface. A remote attacker can trigger the overflow across the network without authentication or user interaction, causing a denial of service on the affected router. The vulnerability is classified under CWE-120: Buffer Copy without Checking Size of Input. No authenticated exploitation is required, which makes exposed management interfaces particularly at risk.
Critical Impact
Unauthenticated remote attackers can crash the UTT nv518G router by sending crafted requests to the gohead/sub_472f08 handler, disrupting network availability.
Affected Products
- UTT nv518G router
- Firmware version nv518GV3v3.2.7-210919-161313
- gohead/sub_472f08 web interface component
Discovery Timeline
- 2026-06-30 - CVE-2026-52195 published to NVD
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-52195
Vulnerability Analysis
The vulnerability is a classic buffer overflow within the gohead/sub_472f08 function of the UTT nv518G router firmware. The gohead web server handles HTTP requests to the device's management interface. The function sub_472f08 copies attacker-controlled input into a fixed-size stack or heap buffer without validating the input length. When the input exceeds the buffer boundary, adjacent memory is corrupted, causing the responsible process to crash and interrupting router services.
Because the flaw is reachable over the network and requires no credentials, any exposed management interface can be attacked directly. The impact is limited to availability, but denial of service on a perimeter router can disrupt an entire network segment. Public technical details are available in the GitHub CVE Report.
Root Cause
The root cause is missing bounds checking on user-supplied input before it is written into a memory buffer inside sub_472f08. This falls under CWE-120, where the copy operation trusts the size of the input rather than the size of the destination. Embedded web stacks such as gohead commonly rely on unsafe string copy primitives that do not enforce length limits.
Attack Vector
A remote attacker sends a crafted HTTP request to the router's web management interface. The request contains an oversized parameter that the sub_472f08 handler processes without length validation. The oversized data overwrites adjacent memory, resulting in a process crash and denial of service. The attack requires network reachability to the management interface but no authentication and no user interaction. The vulnerability affects availability only, with no confidentiality or integrity impact reported. See the UTT Download Resource for firmware information.
Detection Methods for CVE-2026-52195
Indicators of Compromise
- Unexpected reboots or process crashes of the gohead web server on UTT nv518G devices.
- HTTP requests to management URLs containing abnormally long parameter values targeting the sub_472f08 handler.
- Loss of connectivity or interruption of routing services from the affected device.
Detection Strategies
- Inspect HTTP traffic to the router's management interface for oversized query strings or POST bodies.
- Correlate router availability alerts with inbound HTTP requests from untrusted sources.
- Deploy network intrusion detection signatures that flag long parameter values sent to gohead endpoints.
Monitoring Recommendations
- Enable syslog forwarding from the UTT nv518G to a central log platform and alert on gohead process restarts.
- Monitor ICMP and management-plane reachability of the router with active health checks.
- Track inbound traffic to TCP ports used by the router's web administration service.
How to Mitigate CVE-2026-52195
Immediate Actions Required
- Restrict access to the router's web management interface to trusted internal networks only, using ACLs or firewall rules.
- Disable remote WAN-side administration if not required for operations.
- Contact UTT support and monitor the UTT Download Resource for updated firmware addressing the flaw.
Patch Information
At the time of publication, no vendor patch has been referenced in the NVD entry. Administrators should check the UTT download center for firmware releases newer than nv518GV3v3.2.7-210919-161313 and apply them once available.
Workarounds
- Place the router's management interface behind a VPN or jump host so it is not reachable from untrusted networks.
- Apply source IP allowlists that restrict administrative access to a small set of known operator addresses.
- Segment the affected device from user networks to limit the blast radius of a denial-of-service event.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
