CVE-2025-53703: DuraComm SPM-500 Info Disclosure Flaw

CVE-2025-53703 Overview

CVE-2025-53703 is a cleartext transmission vulnerability affecting the DuraComm SPM-500 DP-10iN-100-MU industrial power supply device. The vulnerability allows sensitive data to be transmitted without encryption over network channels, enabling potential interception by malicious actors positioned on the network path.

Critical Impact

Attackers can intercept sensitive data transmitted by the device, potentially exposing credentials, configuration data, and operational information in industrial control system (ICS) environments.

Affected Products

• DuraComm SPM-500 DP-10iN-100-MU

Discovery Timeline

• 2025-07-22 - CVE-2025-53703 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-53703

Vulnerability Analysis

This vulnerability is classified under CWE-319 (Cleartext Transmission of Sensitive Information). The DuraComm SPM-500 DP-10iN-100-MU device transmits sensitive data over unencrypted network channels, making it susceptible to passive network interception attacks. In ICS/SCADA environments where these power supply management devices operate, the exposure of sensitive operational data could have significant consequences for industrial operations.

The network-accessible nature of this vulnerability means that any attacker with access to the network segment where the device communicates can potentially capture sensitive information. This is particularly concerning in industrial environments where network segmentation may be limited or where legacy systems operate alongside modern infrastructure.

Root Cause

The root cause of CVE-2025-53703 stems from the device's failure to implement encryption protocols for network communications. The DuraComm SPM-500 DP-10iN-100-MU transmits data in plaintext, allowing sensitive information such as authentication credentials, device configuration parameters, and operational telemetry to be captured through standard network traffic analysis techniques.

This design flaw reflects a common issue in industrial and embedded devices where encryption capabilities may have been omitted to reduce computational overhead or maintain compatibility with legacy systems.

Attack Vector

The attack vector for this vulnerability is network-based and requires no authentication or user interaction. An attacker positioned on the same network segment as the vulnerable device can passively capture network traffic using packet capture tools. The attacker does not need to actively communicate with the device to exploit this vulnerability, making detection difficult.

In practical scenarios, exploitation could occur through:

• Compromised network infrastructure allowing traffic mirroring
• Man-in-the-middle positioning on shared network segments
• Rogue devices connected to industrial network segments
• Compromised workstations with network visibility to the device

Detection Methods for CVE-2025-53703

Indicators of Compromise

• Unusual network traffic patterns involving the DuraComm SPM-500 device
• Unencrypted protocol traffic (HTTP, Telnet, or proprietary cleartext protocols) originating from or destined to the device
• Network reconnaissance activities targeting device communication ports
• Unauthorized devices appearing on network segments where the SPM-500 operates

Detection Strategies

• Deploy network intrusion detection systems (NIDS) to monitor for cleartext protocol usage involving industrial devices
• Implement deep packet inspection to identify sensitive data transmission in unencrypted form
• Monitor for ARP spoofing or other man-in-the-middle attack indicators on network segments containing vulnerable devices
• Audit network traffic logs for unusual connection patterns to the DuraComm SPM-500

Monitoring Recommendations

• Establish baseline network behavior for the DuraComm SPM-500 device and alert on deviations
• Configure SIEM rules to detect cleartext protocol usage in ICS network segments
• Implement continuous network traffic analysis on segments containing the vulnerable device
• Deploy honeypot devices to detect network reconnaissance targeting industrial equipment

How to Mitigate CVE-2025-53703

Immediate Actions Required

• Isolate the DuraComm SPM-500 DP-10iN-100-MU on a dedicated, segmented network with strict access controls
• Implement encrypted tunneling (VPN/IPsec) for all communications to and from the device
• Deploy network access control lists (ACLs) to restrict which hosts can communicate with the device
• Review and audit all accounts and credentials that may have been exposed through cleartext transmission

Patch Information

At the time of publication, refer to DuraComm for official firmware updates or security patches. The CISA ICS Advisory ICSA-25-203-01 provides additional guidance on this vulnerability. For vendor support, contact DuraComm directly.

Workarounds

• Implement network segmentation to isolate the vulnerable device from untrusted network segments
• Deploy a VPN gateway or encrypted tunnel to protect communications between management stations and the device
• Use application-layer firewalls to filter and monitor traffic to the device
• Consider deploying a protocol-aware proxy that can enforce encryption for device communications
• Restrict physical and logical access to network infrastructure where the device operates

# Network segmentation example - restrict device to dedicated VLAN
# Example iptables rules for management station
iptables -A OUTPUT -d <spm500_ip> -p tcp --dport 80 -j DROP
iptables -A OUTPUT -d <spm500_ip> -p tcp --dport 23 -j DROP
# Allow only through encrypted VPN tunnel
iptables -A OUTPUT -d <spm500_ip> -o tun0 -j ACCEPT