CVE-2025-64385 Overview
CVE-2025-64385 is a critical authentication bypass vulnerability affecting CIRCUTOR industrial IoT devices. The equipment can be configured using the manufacturer's application via Wi-Fi, web server, or proprietary software. When using the manufacturer's software, device configuration is performed over UDP. Analysis of this communication revealed that any aspect of the initial configuration can be modified using only the device's MAC address, without requiring any form of authentication.
Critical Impact
Unauthenticated attackers on the network can completely reconfigure CIRCUTOR industrial IoT devices by simply knowing or discovering the target device's MAC address, potentially leading to denial of service, unauthorized access to industrial systems, or manipulation of critical infrastructure settings.
Affected Products
- CIRCUTOR Industrial IoT Converters and Gateways
- CIRCUTOR devices configurable via UDP protocol
- Industrial automation equipment using CIRCUTOR manufacturer software
Discovery Timeline
- 2025-10-31 - CVE-2025-64385 published to NVD
- 2025-11-04 - Last updated in NVD database
Technical Details for CVE-2025-64385
Vulnerability Analysis
This vulnerability falls under CWE-20 (Improper Input Validation) and represents a fundamental authentication bypass in the device configuration protocol. The affected CIRCUTOR industrial IoT devices accept UDP-based configuration commands that use the device MAC address as the sole identifier for authorization. This design flaw allows any network-accessible attacker to send configuration commands to the device without providing credentials.
The impact is severe in industrial environments where these devices may control or monitor critical infrastructure. Successful exploitation could allow an attacker to modify network settings, disable security features, change operational parameters, or render the device inoperable. The network-based attack vector with no user interaction required makes this vulnerability particularly dangerous in environments where industrial IoT devices are exposed to less-trusted network segments.
Root Cause
The root cause of CVE-2025-64385 is improper input validation combined with missing authentication in the UDP configuration protocol. The manufacturer's software relies solely on the MAC address to identify and authorize configuration changes. MAC addresses are not secrets—they can be discovered through network scanning, ARP tables, or even physical device labels. Using a MAC address as an authentication mechanism violates fundamental security principles, as it provides no proof of authorization or identity verification.
Attack Vector
The attack vector is network-based and requires no authentication or user interaction. An attacker must have network access to the target device's UDP configuration port. The attack sequence involves:
- Discovery of the target device's MAC address through network reconnaissance (ARP scanning, passive traffic analysis, or physical inspection)
- Crafting UDP packets that include the target MAC address as the authorization token
- Sending configuration commands to modify device settings including network parameters, operational modes, or security configurations
- The device accepts and applies the configuration changes without validating the source's authorization
The absence of encryption or integrity checking on the UDP communication further exacerbates the risk, as attackers can also intercept legitimate configuration traffic to learn the protocol format.
Detection Methods for CVE-2025-64385
Indicators of Compromise
- Unexpected UDP traffic to device configuration ports from unauthorized hosts
- Configuration changes logged on CIRCUTOR devices without corresponding authorized administrative activity
- Network reconnaissance activity targeting ARP tables or broadcast traffic to identify device MAC addresses
- Anomalous device behavior following unauthorized configuration modifications
Detection Strategies
- Implement network-based intrusion detection rules to monitor for UDP configuration traffic to CIRCUTOR devices
- Deploy network segmentation with strict access controls limiting which systems can communicate with industrial IoT devices
- Enable comprehensive logging on network switches and firewalls to track all traffic destined for industrial device subnets
- Use SentinelOne Singularity to detect anomalous network behavior patterns associated with reconnaissance and exploitation attempts
Monitoring Recommendations
- Establish baseline network communication patterns for CIRCUTOR devices and alert on deviations
- Monitor for ARP scanning or MAC address enumeration activity within industrial network segments
- Implement configuration change monitoring to detect unauthorized modifications to device settings
- Deploy network traffic analysis to identify UDP packets containing configuration commands from unexpected sources
How to Mitigate CVE-2025-64385
Immediate Actions Required
- Isolate affected CIRCUTOR devices on dedicated network segments with strict access controls
- Implement firewall rules blocking UDP configuration traffic from all unauthorized hosts
- Disable UDP-based configuration if alternative secure configuration methods are available
- Conduct an audit of current device configurations to identify any unauthorized changes
Patch Information
Organizations should consult CIRCUTOR Industrial IoT Products for firmware updates addressing this vulnerability. Additionally, review the technical analysis provided by HackRTU Blog Analysis for detailed information about the vulnerability. Contact the vendor directly for guidance on patching affected devices and implementing secure configuration alternatives.
Workarounds
- Deploy network-level access controls (VLANs, firewalls) to restrict UDP access to affected devices to only authorized management stations
- Use alternative configuration methods (web interface with HTTPS, Wi-Fi with WPA2/WPA3) that may provide stronger authentication
- Implement a dedicated out-of-band management network for industrial IoT device configuration
- Monitor and log all configuration changes to enable rapid detection and response to unauthorized modifications
- Consider deploying a network access control (NAC) solution to prevent unauthorized devices from reaching industrial IoT segments
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
