CVE-2026-31060: UTT HiPER 810G Buffer Overflow Vulnerability

CVE-2026-31060 Overview

A buffer overflow vulnerability has been discovered in the UTT Aggressive HiPER 810G v3v1.7.7-171114 router. The flaw exists within the notes parameter of the formGroupConfig function, where insufficient boundary checking allows attackers to overflow a memory buffer. This vulnerability enables threat actors to cause a Denial of Service (DoS) condition through crafted input, potentially disrupting network availability for organizations using this device.

Critical Impact

Network router denial of service via buffer overflow in administrative configuration function, potentially disrupting connectivity for all dependent network clients.

Affected Products

• UTT Aggressive HiPER 810G v3v1.7.7-171114

Discovery Timeline

• April 6, 2026 - CVE-2026-31060 published to NVD
• April 7, 2026 - Last updated in NVD database

Technical Details for CVE-2026-31060

Vulnerability Analysis

This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), a classic buffer overflow condition. The formGroupConfig function fails to properly validate the length of user-supplied data passed through the notes parameter before copying it into a fixed-size memory buffer.

When an attacker provides input exceeding the allocated buffer size, the overflow corrupts adjacent memory regions. In this case, the corruption leads to application instability and service termination, resulting in a denial of service condition. The attack requires adjacent network access and high privileges, indicating the attacker would need to be on the same local network segment and have administrative access to the device's configuration interface.

Root Cause

The root cause is improper bounds checking in the formGroupConfig function when processing the notes parameter. The function uses an unsafe memory copy operation that does not verify the input length against the destination buffer capacity. This allows data to be written beyond the allocated memory boundary, corrupting the heap or stack depending on the buffer's allocation location.

Attack Vector

The attack vector requires adjacent network access, meaning the attacker must be positioned on the same network segment as the vulnerable device. With high-privilege access to the router's administrative interface, an attacker can submit a crafted request containing an oversized notes parameter value to the formGroupConfig endpoint. The malformed input triggers the buffer overflow, causing the device to crash or become unresponsive.

The vulnerability mechanism involves sending an HTTP request to the router's administrative configuration interface with an excessively long string in the notes parameter field. When the formGroupConfig function processes this request, it attempts to copy the oversized input into a fixed-length buffer without proper length validation. This overflow corrupts memory structures critical to the device's operation, resulting in service disruption. For detailed technical analysis, refer to the GitHub Vulnerability Analysis.

Detection Methods for CVE-2026-31060

Indicators of Compromise

• Unexpected router reboots or service interruptions without clear cause
• Administrative interface becoming unresponsive following configuration changes
• Anomalous HTTP requests to the router's configuration endpoints with unusually large parameter values
• System logs showing memory corruption errors or buffer-related crashes

Detection Strategies

• Monitor network traffic for HTTP requests to the formGroupConfig endpoint containing abnormally large notes parameter values
• Implement intrusion detection rules to alert on requests exceeding expected parameter lengths to router administration interfaces
• Review router logs for repeated crash events or memory allocation failures
• Configure network monitoring to detect unusual administrative access patterns from unexpected network segments

Monitoring Recommendations

• Enable verbose logging on the UTT HiPER router's administrative interface
• Deploy network-based anomaly detection for traffic to management interfaces
• Configure alerts for router availability changes or unexpected reboots
• Implement SentinelOne Singularity for network visibility to detect lateral movement and suspicious traffic patterns targeting network infrastructure

How to Mitigate CVE-2026-31060

Immediate Actions Required

• Restrict administrative interface access to trusted management networks only
• Implement network segmentation to limit adjacent network access to the device
• Disable remote administration if not required for operations
• Monitor for unusual configuration changes or administrative access attempts

Patch Information

No vendor advisory or patch information is currently available for this vulnerability. Organizations should monitor UTT's official support channels for security updates addressing CVE-2026-31060. In the interim, apply network-level mitigations to reduce exposure.

Workarounds

• Configure firewall rules to restrict access to the router's administrative interface to specific trusted IP addresses
• Place the router management interface on a dedicated VLAN accessible only to authorized administrators
• Implement additional authentication mechanisms such as VPN requirements for administrative access
• Consider deploying a web application firewall to filter oversized parameter requests to the management interface

# Example network access restriction (iptables)
# Restrict administrative access to trusted management subnet only
iptables -A INPUT -p tcp --dport 80 -s 192.168.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 192.168.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP