CVE-2025-64093: Zenitel Icx500 Firmware RCE Vulnerability

CVE-2025-64093 Overview

CVE-2025-64093 is a critical Remote Code Execution vulnerability affecting Zenitel ICX500 and ICX510 communication devices. This command injection flaw allows unauthenticated attackers to inject arbitrary commands into the hostname parameter of the device, potentially leading to complete system compromise.

The vulnerability stems from improper input validation (CWE-77: Command Injection) in the hostname configuration functionality. Attackers can exploit this weakness remotely over the network without requiring any authentication or user interaction, making it highly exploitable in real-world scenarios.

Critical Impact

Unauthenticated remote attackers can execute arbitrary commands on vulnerable Zenitel ICX500 and ICX510 devices, potentially gaining complete control over the affected communication infrastructure.

Affected Products

• Zenitel ICX500 Firmware (all versions prior to patch)
• Zenitel ICX500 Hardware
• Zenitel ICX510 Firmware (all versions prior to patch)
• Zenitel ICX510 Hardware

Discovery Timeline

• 2026-01-09 - CVE-2025-64093 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2025-64093

Vulnerability Analysis

This command injection vulnerability exists within the hostname configuration functionality of Zenitel ICX500 and ICX510 devices. The affected firmware fails to properly sanitize user-supplied input when processing hostname values, allowing attackers to inject shell metacharacters and arbitrary commands that are subsequently executed by the underlying operating system.

The vulnerability is particularly severe because it requires no authentication, meaning any attacker with network access to the device can exploit it. The attack can be initiated remotely over the network, and successful exploitation results in complete compromise of confidentiality, integrity, and availability of the affected device.

Zenitel communication devices are commonly deployed in critical infrastructure environments such as healthcare facilities, industrial plants, transportation hubs, and emergency services. Compromise of these devices could enable attackers to intercept communications, disable emergency response systems, or use the devices as a pivot point for further network intrusion.

Root Cause

The root cause of CVE-2025-64093 is improper input validation (CWE-77: Improper Neutralization of Special Elements used in a Command). The firmware fails to sanitize or validate the hostname parameter before passing it to system shell commands. This allows shell metacharacters such as semicolons, pipes, backticks, or command substitution sequences to be interpreted as command separators, enabling injection of arbitrary commands.

The lack of authentication on the vulnerable endpoint compounds the severity, as attackers do not need credentials to reach the affected functionality.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by:

1. Identifying a vulnerable Zenitel ICX500 or ICX510 device on the network
2. Crafting a malicious request that includes shell metacharacters and arbitrary commands within the hostname parameter
3. Sending the request to the device's management interface
4. The injected commands are executed with the privileges of the web server or underlying system process

The vulnerability mechanism involves unsanitized hostname input being passed directly to shell commands. When an attacker includes shell metacharacters (such as ;, |, $(), or backticks) followed by malicious commands, the underlying shell interprets these as separate commands and executes them. For detailed technical information, refer to the Zenitel Security Advisory.

Detection Methods for CVE-2025-64093

Indicators of Compromise

• Unusual hostname values containing shell metacharacters (;, |, $(), backticks) in device configuration logs
• Unexpected outbound network connections from Zenitel ICX devices
• Unauthorized processes running on the device
• Modified system files or configurations on affected devices
• Abnormal HTTP/HTTPS requests to device management interfaces containing encoded command sequences

Detection Strategies

• Monitor network traffic to Zenitel ICX500/ICX510 management interfaces for requests containing shell metacharacters or suspicious URL-encoded characters
• Implement web application firewall (WAF) rules to detect command injection patterns in hostname parameters
• Deploy intrusion detection signatures that alert on exploitation attempts targeting this specific vulnerability
• Review device access logs for unauthorized or anomalous configuration changes

Monitoring Recommendations

• Enable and centralize logging for all Zenitel ICX device management interfaces
• Configure alerts for any hostname configuration changes on production devices
• Monitor for unexpected network connections originating from Zenitel devices to external IP addresses
• Implement baseline monitoring to detect deviations in normal device behavior

How to Mitigate CVE-2025-64093

Immediate Actions Required

• Apply the security patch released by Zenitel as documented in the official security advisory
• If patching is not immediately possible, restrict network access to device management interfaces to trusted administrator IP addresses only
• Place vulnerable devices behind network segmentation and firewall rules that limit management access
• Conduct a security audit of all deployed Zenitel ICX500 and ICX510 devices to identify potentially compromised systems

Patch Information

Zenitel has released a security advisory addressing this vulnerability. Administrators should consult the Zenitel Security Advisory for specific patch information and firmware update instructions. Contact Zenitel support for the latest firmware version that remediates CVE-2025-64093.

Workarounds

• Implement network access controls to restrict management interface access to authorized administrators only
• Deploy a web application firewall (WAF) to filter malicious input patterns targeting the hostname parameter
• Disable or block remote management access if not operationally required
• Use VPN or jump servers to access device management interfaces rather than exposing them directly to the network

# Example firewall rule to restrict management access (adjust for your environment)
# Allow management access only from trusted admin subnet
iptables -A INPUT -p tcp --dport 443 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
iptables -A INPUT -p tcp --dport 80 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP