CVE-2026-20764: Copeland Xweb 300d Pro RCE Vulnerability

CVE-2026-20764 Overview

An OS command injection vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, enabling an authenticated attacker to achieve remote code execution on the system by providing malicious input via the device hostname configuration which is later processed during system setup, resulting in remote code execution.

Critical Impact

Authenticated attackers can execute arbitrary OS commands on affected Copeland XWEB Pro devices, potentially leading to complete system compromise of industrial control systems and refrigeration monitoring infrastructure.

Affected Products

• Copeland XWEB 300D Pro (Firmware version 1.12.1 and prior)
• Copeland XWEB 500D Pro (Firmware version 1.12.1 and prior)
• Copeland XWEB 500B Pro (Firmware version 1.12.1 and prior)

Discovery Timeline

• 2026-02-27 - CVE-2026-20764 published to NVD
• 2026-02-27 - Last updated in NVD database

Technical Details for CVE-2026-20764

Vulnerability Analysis

This vulnerability is classified as CWE-78: Improper Neutralization of Special Elements used in an OS Command (OS Command Injection). The flaw exists in the device hostname configuration functionality of Copeland XWEB Pro industrial controllers. When an authenticated user modifies the hostname setting, the input is not properly sanitized before being passed to underlying system commands during the system setup process. This allows an attacker with valid credentials to inject arbitrary OS commands that will be executed with the privileges of the web application.

The attack can be performed remotely over the network and requires low complexity to exploit. While authentication is required, once an attacker has valid credentials (which may be obtained through default credentials, credential stuffing, or social engineering), they can achieve complete compromise of the device's confidentiality, integrity, and availability.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization in the hostname configuration handler. The application fails to properly neutralize shell metacharacters and command separators (such as ;, |, &, $(), or backticks) before incorporating user-supplied hostname values into system commands. This allows attackers to break out of the intended command context and inject additional commands.

Attack Vector

The attack vector is network-based, requiring an authenticated session to the XWEB Pro web interface. An attacker would:

1. Authenticate to the XWEB Pro web management interface
2. Navigate to the system configuration or hostname settings
3. Inject malicious shell commands within the hostname field using command separators
4. Trigger the system setup process that processes the hostname value
5. The injected commands execute on the underlying operating system

This type of vulnerability is particularly concerning in Industrial Control System (ICS) and Operational Technology (OT) environments where these refrigeration monitoring devices are deployed, as successful exploitation could impact critical infrastructure operations.

The vulnerability can be exploited by crafting a malicious hostname value that includes shell metacharacters to append or chain additional commands. For example, a payload could terminate the expected hostname command and execute arbitrary commands such as establishing reverse shells or modifying system configurations.

Detection Methods for CVE-2026-20764

Indicators of Compromise

• Unusual outbound network connections from XWEB Pro devices to unknown IP addresses
• Unexpected processes or services running on the device outside of normal operations
• Modified system files or configuration changes not initiated by authorized personnel
• Authentication logs showing unusual login patterns or access to configuration pages

Detection Strategies

• Monitor HTTP/HTTPS traffic to XWEB Pro devices for requests containing shell metacharacters (;, |, &, `, $()) in hostname or configuration parameters
• Implement network segmentation monitoring to detect anomalous traffic from ICS/OT network segments
• Review web application logs for suspicious POST requests to hostname configuration endpoints
• Deploy network intrusion detection signatures for OS command injection patterns targeting industrial controllers

Monitoring Recommendations

• Enable comprehensive logging on XWEB Pro devices and forward logs to a centralized SIEM
• Monitor for any new or unexpected cron jobs, scheduled tasks, or persistent mechanisms on the devices
• Implement network anomaly detection for unusual traffic patterns from refrigeration monitoring systems

How to Mitigate CVE-2026-20764

Immediate Actions Required

• Apply the latest firmware update from Copeland as soon as it becomes available via the Copeland System Software Update portal
• Restrict network access to XWEB Pro devices to authorized management stations only
• Implement strong authentication credentials and disable any default accounts
• Segment XWEB Pro devices on isolated network segments with strict firewall rules

Patch Information

Copeland has been notified of this vulnerability. Users should visit the Copeland System Software Update page to check for and download the latest firmware versions that address this vulnerability. Additional technical details are available in the CISA ICS Advisory ICSA-26-057-10.

Workarounds

• Implement network-level access controls to restrict which IP addresses can access the XWEB Pro web interface
• Place XWEB Pro devices behind a VPN and require VPN authentication before accessing the management interface
• Monitor and audit all configuration changes made to the devices through out-of-band logging mechanisms
• Consider implementing a web application firewall (WAF) to filter malicious input patterns if direct patching is not immediately possible

# Example network segmentation using iptables
# Restrict XWEB Pro management interface access to specific management VLAN
iptables -A INPUT -p tcp --dport 80 -s 192.168.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP