CVE-2025-23417 Overview
A denial of service vulnerability exists in the Modbus RTU over TCP functionality of Socomec DIRIS Digiware M-70 firmware version 1.6.9. This vulnerability allows an unauthenticated attacker to send specially crafted network packets to trigger a denial of service condition, rendering the device unavailable and potentially disrupting critical industrial control system (ICS) operations.
The vulnerability is classified under CWE-306 (Missing Authentication for Critical Function), indicating that the affected Modbus RTU over TCP functionality lacks proper authentication controls, allowing attackers to exploit the service without valid credentials.
Critical Impact
Unauthenticated remote attackers can cause denial of service on industrial power monitoring equipment, potentially disrupting electrical infrastructure monitoring and management capabilities.
Affected Products
- Socomec DIRIS Digiware M-70 Firmware version 1.6.9
- Socomec DIRIS Digiware M-70 Hardware
Discovery Timeline
- December 1, 2025 - CVE-2025-23417 published to NVD
- December 5, 2025 - Last updated in NVD database
Technical Details for CVE-2025-23417
Vulnerability Analysis
This vulnerability carries a CVSS v3.1 score of 7.5 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The scoring indicates:
- Attack Vector (AV:N): Network-accessible, meaning the vulnerability can be exploited remotely
- Attack Complexity (AC:L): Low complexity, requiring no special conditions
- Privileges Required (PR:N): No authentication needed to exploit
- User Interaction (UI:N): No user interaction required
- Scope (S:U): Unchanged, impact limited to the vulnerable component
- Confidentiality (C:N): No impact on confidentiality
- Integrity (I:N): No impact on integrity
- Availability (A:H): High impact on availability
The EPSS (Exploit Prediction Scoring System) data shows a probability of 0.053% with a percentile ranking of 16.83%, indicating a relatively low likelihood of exploitation in the wild at this time.
Root Cause
The root cause of this vulnerability is the Missing Authentication for Critical Function (CWE-306) in the Modbus RTU over TCP service implementation. The DIRIS Digiware M-70 device fails to properly authenticate incoming Modbus requests, allowing any network-connected attacker to send malicious packets directly to the service without credentials verification. This architectural weakness in the protocol implementation exposes the device to abuse from unauthenticated sources.
Attack Vector
The attack vector leverages the network-accessible Modbus RTU over TCP service running on the Socomec DIRIS Digiware M-70 device. An attacker can send specially crafted network packets to the Modbus service endpoint, which processes these malformed requests without authentication. The vulnerability allows remote exploitation with low attack complexity, requiring no privileges or user interaction.
The exploitation mechanism involves sending malformed or specially crafted Modbus RTU packets over TCP to the target device. When the device processes these packets, it enters a denial of service state, disrupting normal operations. Industrial environments utilizing these devices for power monitoring and management are particularly at risk, as a successful attack could blind operators to electrical system status and events.
For detailed technical analysis of the vulnerability, refer to the Cisco Talos security advisory (TALOS-2025-2139) and the official Socomec security bulletin.
Detection Methods for CVE-2025-23417
Indicators of Compromise
- Unusual or high volume of Modbus RTU over TCP traffic targeting the DIRIS Digiware M-70 device
- Device unresponsiveness or unexpected reboots following network traffic anomalies
- Malformed Modbus packets in network traffic captures directed at the affected device
- Connection attempts from unauthorized IP addresses to the Modbus service port
Detection Strategies
Network-based detection should focus on monitoring Modbus TCP traffic for anomalies. Security teams should implement intrusion detection system (IDS) rules to identify:
- Volumetric anomalies: Sudden increases in Modbus traffic volume targeting specific devices
- Protocol anomalies: Malformed Modbus packets that deviate from standard protocol specifications
- Source validation: Connection attempts from IP addresses outside of expected operational networks
- Packet inspection: Deep packet inspection of Modbus payloads for known malicious patterns
SentinelOne Singularity platform provides comprehensive protection through behavioral analysis and network traffic monitoring capabilities that can detect exploitation attempts targeting ICS/SCADA environments.
Monitoring Recommendations
Organizations should implement the following monitoring practices:
- Network segmentation monitoring: Ensure ICS networks are properly segmented and monitor for cross-segment traffic violations
- Asset inventory: Maintain accurate inventory of all DIRIS Digiware M-70 devices and their firmware versions
- Log aggregation: Centralize logs from network devices, firewalls, and IDS systems for correlation analysis
- Availability monitoring: Implement health checks on affected devices to detect denial of service conditions quickly
- Traffic baselining: Establish baseline Modbus traffic patterns to identify deviations indicative of attack attempts
How to Mitigate CVE-2025-23417
Immediate Actions Required
- Review and apply security updates from Socomec for the DIRIS Digiware M-70 device
- Implement network segmentation to isolate affected devices from untrusted networks
- Deploy firewall rules to restrict Modbus service access to authorized management systems only
- Enable logging and monitoring on network devices protecting the affected systems
- Conduct an inventory audit to identify all vulnerable devices in your environment
Patch Information
Socomec has released security information regarding this vulnerability. Organizations should consult the official Socomec security bulletin available at:
Additionally, detailed vulnerability information is available in the Cisco Talos advisory:
Contact Socomec support for specific firmware update availability and upgrade procedures for your deployment.
Workarounds
If immediate patching is not possible, implement the following compensating controls:
Network isolation: Place affected devices behind firewalls with strict access control lists (ACLs) that only permit connections from authorized management stations
VPN requirements: Require VPN connections for any remote access to networks containing vulnerable devices
Traffic filtering: Configure network devices to filter and drop suspicious Modbus traffic patterns
Access restrictions: Limit Modbus service access to specific IP addresses or network ranges using firewall rules
# Example iptables rules to restrict Modbus TCP access (port 502)
# Allow only trusted management network
iptables -A INPUT -p tcp --dport 502 -s 192.168.100.0/24 -j ACCEPT
# Drop all other Modbus traffic
iptables -A INPUT -p tcp --dport 502 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
