UTT HiPER 810G Buffer Overflow RCE (CVE-2026-3016)

Vendor-confirmed - CVE-2026-3016 is a high buffer overflow in UTT HiPER 810G router firmware version 1.7.7-171114 or earlier that grants unauthenticated remote code execution. Public exploit code increases the urgency to update immediately.

Overview

A high-severity security flaw has been discovered in specific versions of the UTT HiPER 810G router. The vulnerability is a classic buffer overflow located in the device’s web management interface. Attackers can exploit this flaw remotely to potentially crash the device or execute malicious code.

Vulnerability Details

In simple terms, the router’s software uses an unsafe method to handle data input on a specific configuration page (/goform/formP2PLimitConfig). The vulnerable function (strcpy) does not properly check the size of the data being copied. By sending an overly long string in the “except” parameter, an attacker can overflow the allocated memory buffer.

This overflow can corrupt the router’s normal operation, leading to a denial-of-service (crash/reboot) or, more critically, allowing the attacker to take control of the device. Publicly available exploit code increases the risk, as it lowers the barrier for attackers.

Impact Assessment

The impact of a successful exploit is significant:

• Service Disruption: The router may become unstable or unresponsive, causing network downtime for all connected users and services.
• Device Compromise: An attacker could gain unauthorized administrative access to the router.
• Network Breach: A compromised router can be used to intercept traffic, redirect users to malicious sites, or launch further attacks into the internal network.

This vulnerability is remotely exploitable, meaning an attacker can launch the attack from the internet without needing prior access to your local network.

Remediation and Mitigation

Immediate action is required for all users of the UTT HiPER 810G router.

Primary Action: Update Firmware

1. Check Your Version: Log into your router’s web admin interface and navigate to the system information page.
2. Upgrade Immediately: If your firmware version is 1.7.7-171114 or earlier, you must upgrade to the latest version provided by UTT. Contact UTT support or check their official website for a patched firmware release that addresses CVE-2026-3016.

Interim Mitigations (If No Patch is Available):

• Restrict Access: Configure the router’s firewall to restrict access to the web management interface (port 80/443) to only trusted, necessary IP addresses. Do not expose the admin interface directly to the public internet.
• Monitor for Updates: Frequently check the vendor’s site for a security patch and apply it as soon as it is released.

Given the public exploit availability, treating this vulnerability as a high-priority fix is crucial for maintaining network security.