CVE-2025-41269: Waterfall WF-500 Firmware RCE Vulnerability

CVE-2025-41269 Overview

CVE-2025-41269 is an OS command injection vulnerability [CWE-78] in the Console WebUI of Waterfall WF-500 TX and RX Hosts running firmware version 7.9.1.0 R2502171040. Nozomi Networks Labs identified the flaw, which allows remote unauthenticated attackers to execute arbitrary operating system commands on affected devices. The vulnerability stems from improper neutralization of special elements passed to OS command interpreters through the management interface. Waterfall WF-500 hardware enforces unidirectional data flows in operational technology (OT) environments, making the device a security boundary for critical infrastructure.

Critical Impact

Remote unauthenticated attackers can execute arbitrary OS commands on Waterfall WF-500 TX and RX hosts, compromising a device used to enforce unidirectional security boundaries in OT networks.

Affected Products

• Waterfall Security WF-500 hardware appliance
• Waterfall Security WF-500 firmware version 7.9.1.0 R2502171040
• WF-500 TX and RX Host Console WebUI

Discovery Timeline

• 2026-05-29 - CVE-2025-41269 published to NVD
• 2026-06-01 - Last updated in NVD database

Technical Details for CVE-2025-41269

Vulnerability Analysis

The vulnerability resides in the Console WebUI exposed by Waterfall WF-500 TX and RX Hosts. The web management interface accepts user-controlled input and passes it to an underlying OS command interpreter without adequate sanitization. Attackers can inject shell metacharacters such as ;, |, &, or backticks to break out of the intended command context and execute arbitrary commands. The flaw is reachable over the network without authentication, eliminating any prerequisite for credentials or user interaction. Successful exploitation grants attackers code execution with the privileges of the web management process on the device.

Because the WF-500 functions as a unidirectional security gateway in industrial environments, compromise of the device undermines the trust boundary it enforces between segmented networks. Attackers gaining command execution can manipulate device configuration, pivot to adjacent OT systems, or disable security controls.

Root Cause

The root cause is improper neutralization of special elements used in OS commands [CWE-78]. Input received by the Console WebUI is concatenated into command strings executed by the operating system. The application does not enforce input validation, allow-listing, or safe API usage such as parameterized command execution.

Attack Vector

An attacker reaches the Console WebUI over the network, submits a crafted HTTP request containing shell metacharacters in a vulnerable parameter, and triggers command execution. No authentication, privileges, or user interaction are required. Refer to the Nozomi Networks Vulnerability Advisory for additional technical details.

Detection Methods for CVE-2025-41269

Indicators of Compromise

• HTTP requests to the WF-500 Console WebUI containing shell metacharacters such as ;, |, &&, backticks, or $()
• Unexpected child processes spawned by the web management service on the WF-500 appliance
• Outbound network connections originating from the WF-500 to non-administrative endpoints
• Configuration changes or new user accounts created outside of approved change windows

Detection Strategies

• Inspect WebUI access logs for anomalous query parameters and POST bodies containing command-injection patterns
• Correlate management interface traffic with process execution telemetry from upstream and downstream OT hosts
• Alert on HTTP requests to the WF-500 from source addresses outside the documented management network

Monitoring Recommendations

• Forward WF-500 syslog and web server logs to a centralized SIEM for retention and analysis
• Baseline normal administrative activity and alert on deviations such as off-hours access
• Monitor north-south and east-west traffic adjacent to the WF-500 for signs of post-exploitation pivoting

How to Mitigate CVE-2025-41269

Immediate Actions Required

• Restrict network access to the Console WebUI to a dedicated, isolated management VLAN
• Block all inbound connections to the WF-500 management interface from untrusted networks at the perimeter firewall
• Audit the WF-500 for unauthorized configuration changes, new accounts, and unexpected processes
• Contact Waterfall Security support to obtain remediation guidance for firmware version 7.9.1.0 R2502171040

Patch Information

Consult the Nozomi Networks Vulnerability Advisory and Waterfall Security support channels for the latest firmware update addressing CVE-2025-41269. Apply the vendor-supplied fix to all WF-500 TX and RX Hosts running the affected version.

Workarounds

• Place the WF-500 Console WebUI behind a jump host that enforces multi-factor authentication
• Apply strict ACLs on management switches to permit only authorized administrator workstations
• Disable or filter the WebUI entirely if administrative tasks can be performed through an out-of-band channel

# Example firewall ACL restricting access to the WF-500 management interface
# Replace <WF500_MGMT_IP> and <ADMIN_SUBNET> with environment-specific values
iptables -A INPUT -p tcp -s <ADMIN_SUBNET> -d <WF500_MGMT_IP> --dport 443 -j ACCEPT
iptables -A INPUT -p tcp -d <WF500_MGMT_IP> --dport 443 -j DROP