CVE-2026-2080: UTT HiPER 810 RCE Vulnerability

CVE-2026-2080 Overview

A command injection vulnerability has been discovered in UTT HiPER 810 firmware version 1.7.4-141218. This vulnerability affects the setSysAdm function within the /goform/formUser file, where improper handling of the passwd1 argument allows attackers to inject and execute arbitrary system commands. Remote exploitation is possible, and proof-of-concept exploit code has been publicly disclosed.

Critical Impact

Remote attackers with administrative privileges can execute arbitrary commands on the affected device, potentially leading to complete device compromise, network pivoting, and unauthorized access to connected systems.

Affected Products

• UTT HiPER 810 Firmware Version 1.7.4-141218

Discovery Timeline

• 2026-02-07 - CVE-2026-2080 published to NVD
• 2026-02-09 - Last updated in NVD database

Technical Details for CVE-2026-2080

Vulnerability Analysis

This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly referred to as injection. The flaw resides in how the UTT HiPER 810 router processes user-supplied input through its web management interface.

The setSysAdm function in /goform/formUser fails to properly sanitize the passwd1 parameter before incorporating it into system-level commands. This lack of input validation allows an authenticated attacker to inject shell metacharacters and arbitrary commands that are then executed with the privileges of the web server process, typically running as root on embedded devices.

The network-accessible nature of this vulnerability combined with the high-privilege context makes it particularly dangerous for organizations using these devices at network boundaries.

Root Cause

The root cause is insufficient input validation and sanitization in the setSysAdm function. When processing the passwd1 argument, the application directly passes user-controlled data to system shell functions without escaping special characters or using parameterized command execution. This allows shell metacharacters such as semicolons, pipes, or backticks to break out of the intended command context and execute attacker-supplied commands.

Attack Vector

The attack is conducted remotely over the network through the device's web management interface. An attacker with administrative credentials can craft a malicious HTTP request to the /goform/formUser endpoint, manipulating the passwd1 parameter to include command injection payloads.

The exploitation mechanism involves submitting specially crafted input that includes shell command separators followed by malicious commands. When the setSysAdm function processes this input, the injected commands are executed on the underlying operating system. This could allow attackers to establish reverse shells, exfiltrate configuration data, modify device settings, or use the compromised device as a pivot point for further network attacks.

For detailed technical reproduction steps, refer to the GitHub PoC Repository.

Detection Methods for CVE-2026-2080

Indicators of Compromise

• Unexpected HTTP POST requests to /goform/formUser containing shell metacharacters (;, |, $(, `) in the passwd1 parameter
• Unusual outbound network connections from UTT HiPER 810 devices
• Presence of unexpected processes or shell sessions on the device
• Modified system configuration files or unauthorized user accounts

Detection Strategies

• Implement network-based intrusion detection rules to monitor for suspicious requests to /goform/formUser endpoints containing potential command injection patterns
• Deploy web application firewall (WAF) rules to filter requests containing shell metacharacters in form parameters
• Monitor authentication logs for the web management interface for anomalous access patterns or brute-force attempts

Monitoring Recommendations

• Enable comprehensive logging on network perimeter devices and centralize logs for analysis
• Monitor for unusual traffic patterns from UTT HiPER 810 devices, particularly unexpected outbound connections
• Implement network segmentation monitoring to detect potential lateral movement from compromised network devices

How to Mitigate CVE-2026-2080

Immediate Actions Required

• Restrict network access to the UTT HiPER 810 web management interface to trusted IP addresses only using firewall rules
• Disable remote administration if not strictly required for operations
• Implement strong, unique administrative credentials and rotate them regularly
• Consider replacing the affected device with actively supported alternatives if no vendor patch is available

Patch Information

The vendor (UTT) was contacted early about this disclosure but did not respond. As of the last update on 2026-02-09, no official patch has been released. Organizations should implement the workarounds listed below and monitor for vendor updates.

For additional context and tracking information, refer to the VulDB Advisory.

Workarounds

• Isolate affected devices on a separate network segment with strict access controls
• Deploy a reverse proxy or firewall in front of the device to filter malicious requests containing command injection patterns
• Implement IP-based access control lists to limit management interface access to authorized administrators only
• Monitor device behavior and network traffic for signs of compromise while awaiting a vendor patch

# Example firewall rule to restrict management interface access (iptables)
# Allow only trusted admin subnet to access web interface
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP