CVE-2026-1162: UTT HiPER 810 Buffer Overflow Vulnerability

CVE-2026-1162 Overview

A critical buffer overflow vulnerability has been identified in UTT HiPER 810 routers running firmware version 1.7.4-141218. The vulnerability exists in the strcpy function within the /goform/setSysAdm endpoint, where improper handling of the passwd1 argument allows attackers to trigger a buffer overflow condition. This network-accessible flaw enables remote exploitation without authentication, potentially allowing attackers to execute arbitrary code or cause denial of service on affected devices.

Critical Impact

Remote attackers can exploit this buffer overflow vulnerability over the network without authentication to potentially gain control of affected UTT HiPER 810 routers, compromising network infrastructure security.

Affected Products

• UTT HiPER 810 Firmware version 1.7.4-141218

Discovery Timeline

• January 19, 2026 - CVE-2026-1162 published to NVD
• January 19, 2026 - Last updated in NVD database

Technical Details for CVE-2026-1162

Vulnerability Analysis

This vulnerability stems from unsafe memory operations in the UTT HiPER 810 router's web management interface. The affected code resides in the /goform/setSysAdm form handler, which processes administrative password changes. When handling the passwd1 parameter, the firmware uses the strcpy function without proper bounds checking, creating a classic stack-based buffer overflow condition.

The vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), indicating that the application fails to properly constrain read and write operations to intended memory boundaries. This allows an attacker to overwrite adjacent memory locations, potentially corrupting stack frames, overwriting return addresses, or manipulating program execution flow.

Root Cause

The root cause of this vulnerability is the use of the inherently unsafe strcpy function to copy user-supplied input from the passwd1 parameter into a fixed-size buffer without validating the input length. The strcpy function copies data until it encounters a null terminator, with no consideration for the destination buffer's capacity. When an attacker supplies a password value exceeding the expected buffer size, the function continues writing past the buffer boundary, corrupting adjacent memory.

Attack Vector

The attack vector is network-based, allowing remote exploitation without requiring authentication or user interaction. An attacker can craft a malicious HTTP POST request to the /goform/setSysAdm endpoint containing an oversized passwd1 parameter. The exploitation process involves:

1. Identifying a vulnerable UTT HiPER 810 device exposed on the network
2. Sending a crafted HTTP request to the /goform/setSysAdm endpoint
3. Including an excessively long string in the passwd1 parameter to overflow the buffer
4. Overwriting critical memory structures such as the return address on the stack
5. Potentially redirecting execution to attacker-controlled code or causing a denial of service

A proof-of-concept has been published demonstrating this vulnerability. Technical details are available in the GitHub PoC Documentation.

Detection Methods for CVE-2026-1162

Indicators of Compromise

• Unusual HTTP POST requests to /goform/setSysAdm with abnormally long passwd1 parameter values
• Router crashes or unexpected reboots following administrative interface access
• Evidence of unauthorized configuration changes on affected devices
• Network traffic anomalies indicating buffer overflow exploitation attempts

Detection Strategies

• Deploy web application firewall rules to detect and block HTTP requests with oversized password parameters targeting /goform/setSysAdm
• Implement intrusion detection signatures monitoring for exploitation patterns associated with CVE-2026-1162
• Configure network monitoring to alert on unusual traffic patterns to UTT HiPER 810 management interfaces

Monitoring Recommendations

• Enable logging on affected devices to capture all requests to the web management interface
• Monitor network traffic for POST requests to /goform/setSysAdm containing unusually large payloads
• Implement network segmentation to restrict access to router management interfaces from untrusted networks
• Review VulDB entries for updated threat intelligence related to this vulnerability

How to Mitigate CVE-2026-1162

Immediate Actions Required

• Restrict network access to the UTT HiPER 810 web management interface using firewall rules or access control lists
• Disable remote management if not required for operations
• Place affected devices behind a firewall that can filter malicious requests
• Monitor for any available firmware updates from UTT that address this vulnerability

Patch Information

At the time of publication, no vendor patch has been confirmed for this vulnerability. Organizations should contact UTT directly for security updates and monitor the following resources for updates:

• VulDB Entry #341756 for vulnerability tracking
• GitHub PoC Repository for technical details

Workarounds

• Implement network-level access controls to limit management interface access to trusted IP addresses only
• Deploy a reverse proxy or web application firewall to validate and sanitize incoming requests before they reach the device
• Consider replacing affected devices with alternative hardware if vendor patches are not forthcoming
• Implement network segmentation to isolate vulnerable devices from critical infrastructure

# Example iptables rules to restrict management interface access
# Allow management access only from trusted administrator subnet
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP

# Block external access to the vulnerable endpoint
iptables -A INPUT -p tcp --dport 80 -s 0.0.0.0/0 -j DROP