CVE-2026-5544: UTT HiPER 1250GW Buffer Overflow Flaw

CVE-2026-5544 Overview

A stack-based buffer overflow vulnerability has been discovered in UTT HiPER 1250GW wireless gateway devices running firmware versions up to 3.2.7-210907-180535. The vulnerability exists in an unknown function within the file /goform/formRemoteControl, where improper handling of the Profile argument allows attackers to trigger a buffer overflow condition. This firmware vulnerability can be exploited remotely over the network, potentially allowing attackers to execute arbitrary code or cause denial of service on affected devices.

Critical Impact

Remote attackers can exploit this stack-based buffer overflow to potentially achieve code execution on vulnerable UTT HiPER 1250GW devices, compromising network infrastructure security.

Affected Products

• UTT HiPER 1250GW firmware versions up to 3.2.7-210907-180535
• UTT HiPER 1250GW wireless gateway devices

Discovery Timeline

• 2026-04-05 - CVE-2026-5544 published to NVD
• 2026-04-07 - Last updated in NVD database

Technical Details for CVE-2026-5544

Vulnerability Analysis

This vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), which encompasses buffer overflow conditions where data is written beyond allocated memory boundaries. The affected component resides in the web management interface of the UTT HiPER 1250GW device, specifically within the /goform/formRemoteControl endpoint.

When processing requests to this endpoint, the firmware fails to properly validate the length of the Profile argument before copying it into a fixed-size stack buffer. This allows an attacker to supply an oversized input that overwrites adjacent memory on the stack, including potentially critical control flow data such as return addresses and saved frame pointers.

The exploit has been publicly disclosed and may be actively used in attacks targeting vulnerable UTT HiPER 1250GW devices. Network routers and gateways are particularly attractive targets as they often sit at network boundaries and provide access to internal infrastructure.

Root Cause

The root cause of this vulnerability is insufficient bounds checking when handling user-supplied input in the Profile argument. The firmware code responsible for processing the /goform/formRemoteControl request copies user input directly into a stack-allocated buffer without verifying that the input length does not exceed the buffer's capacity. This classic memory safety issue allows attackers to corrupt stack memory by providing maliciously crafted input that exceeds expected boundaries.

Attack Vector

The attack can be executed remotely over the network by sending specially crafted HTTP requests to the vulnerable /goform/formRemoteControl endpoint on the device's web management interface. The attacker manipulates the Profile parameter with an oversized payload designed to overflow the stack buffer and overwrite critical memory structures.

A successful exploitation would involve:

1. Identifying a vulnerable UTT HiPER 1250GW device accessible over the network
2. Crafting an HTTP request to /goform/formRemoteControl with a malicious Profile parameter
3. The oversized payload overflows the stack buffer, corrupting control data
4. The attacker gains control of program execution, potentially leading to arbitrary code execution

The vulnerability requires low privileges to exploit and does not require user interaction. Technical details and proof-of-concept information have been submitted to VulDB and are available in the GitHub CVE Issue.

Detection Methods for CVE-2026-5544

Indicators of Compromise

• Unusual HTTP POST requests to /goform/formRemoteControl with abnormally large Profile parameter values
• Unexpected device reboots or crashes indicating potential exploitation attempts
• Anomalous network traffic patterns from UTT HiPER 1250GW devices
• Evidence of unauthorized configuration changes on the device

Detection Strategies

• Implement network intrusion detection rules to monitor for HTTP requests to /goform/formRemoteControl containing oversized payloads
• Deploy web application firewalls (WAF) to filter requests with excessively long Profile parameters
• Enable detailed logging on the device management interface to capture suspicious access attempts
• Use SentinelOne Singularity platform to detect and respond to exploitation attempts targeting network devices

Monitoring Recommendations

• Monitor network traffic to and from UTT HiPER 1250GW devices for anomalous patterns
• Regularly review device logs for signs of exploitation or unauthorized access
• Implement network segmentation to isolate management interfaces from untrusted networks
• Configure alerting for unexpected device restarts or configuration changes

How to Mitigate CVE-2026-5544

Immediate Actions Required

• Restrict access to the web management interface to trusted IP addresses only
• Disable remote management access if not required for operations
• Implement network-level access controls (ACLs) to limit who can reach the device management interface
• Monitor devices for signs of compromise while awaiting vendor patches

Patch Information

No vendor patch information is currently available. Organizations should monitor UTT Technologies' official channels for security updates addressing this vulnerability. In the absence of a patch, implementing the workarounds and network-level protections described below is critical.

For additional technical details, refer to:

• VulDB Vulnerability Entry
• GitHub CVE Issue

Workarounds

• Place the device management interface behind a VPN or firewall that restricts access to authorized administrators only
• Disable the web management interface entirely if alternative management methods are available
• Implement input validation and request filtering at the network perimeter using reverse proxies or WAF appliances
• Consider replacing vulnerable devices with alternative hardware until patches are available

# Example: Restrict management interface access via firewall rules
# Block external access to web management port (adjust port as needed)
iptables -A INPUT -p tcp --dport 80 -s ! 192.168.1.0/24 -j DROP
iptables -A INPUT -p tcp --dport 443 -s ! 192.168.1.0/24 -j DROP

# Allow only specific management workstation
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.100 -j ACCEPT