CVE-2024-48882: Socomec Diris M-70 Firmware DOS Vulnerability

CVE-2024-48882 Overview

CVE-2024-48882 is a denial of service vulnerability in the Modbus TCP functionality of the Socomec DIRIS Digiware M-70 power monitoring device running firmware version 1.6.9. A specially crafted network packet sent to the Modbus TCP service can render the device unresponsive. The flaw is classified under [CWE-306: Missing Authentication for Critical Function], allowing an unauthenticated remote attacker to trigger the condition without user interaction.

Critical Impact
Unauthenticated attackers on the network can disrupt monitoring and metering operations on affected Socomec DIRIS Digiware M-70 devices by sending a single crafted Modbus TCP packet.

Affected Products

Socomec DIRIS Digiware M-70 hardware
Socomec DIRIS Digiware M-70 firmware version 1.6.9
Deployments exposing Modbus TCP (TCP/502) on operational technology (OT) networks

Discovery Timeline

2025-12-01 - CVE-2024-48882 published to NVD
2025-12-05 - Last updated in NVD database

Technical Details for CVE-2024-48882

Vulnerability Analysis

The Socomec DIRIS Digiware M-70 is an industrial energy and power monitoring gateway commonly deployed in electrical distribution environments. The device exposes a Modbus TCP service used for telemetry, configuration, and integration with supervisory control and data acquisition (SCADA) systems. The vulnerability resides in how this Modbus TCP implementation parses incoming network packets.

When the device receives a specifically malformed Modbus TCP frame, the firmware fails to handle the input safely and enters a state that interrupts normal service. The result is a denial of service condition affecting the metering and communication functions of the gateway. According to the Talos Intelligence advisory, the issue is reachable without authentication, meaning any host able to communicate with TCP port 502 on the device can trigger it.

Because the DIRIS Digiware M-70 sits between physical measurement modules and upstream monitoring infrastructure, loss of availability disrupts visibility into electrical parameters across the monitored installation. Refer to the Talos Intelligence Vulnerability Report TALOS-2024-2119 and the Socomec CVE-2024-48882 Advisory for vendor-confirmed technical detail.

Root Cause

The root cause is missing authentication on the Modbus TCP interface combined with insufficient validation of incoming protocol packets. Modbus TCP has no native authentication, so the firmware must enforce strict parsing of received frames. The DIRIS Digiware M-70 firmware version 1.6.9 does not adequately validate packet structure, leading to a fault condition when a crafted frame is processed.

Attack Vector

The vulnerability is exploitable over the network with low attack complexity and no privileges required. An attacker with network reachability to TCP port 502 on the device can send a single crafted Modbus TCP packet to trigger the denial of service. No prior authentication, session establishment, or user interaction is needed, which is consistent with the EPSS score of 0.075% reflecting low but non-trivial exposure risk for internet-exposed OT assets.

The vulnerability mechanism is described in the Talos Intelligence advisory. No public proof-of-concept exploit code has been released.

Detection Methods for CVE-2024-48882

Indicators of Compromise

Unexpected unresponsiveness of Socomec DIRIS Digiware M-70 devices on TCP/502, including loss of SCADA polling responses
Inbound Modbus TCP traffic from unauthorized source IP addresses targeting energy monitoring gateways
Malformed Modbus Application Protocol (MBAP) headers or function codes captured in packet traces preceding device outages

Detection Strategies

Deploy passive OT network monitoring to inspect Modbus TCP traffic for malformed frames and protocol anomalies
Establish a baseline of legitimate Modbus master IP addresses and alert on any new source initiating connections to DIRIS devices
Correlate device availability gaps with network packet captures to identify denial-of-service patterns

Monitoring Recommendations

Enable syslog or SNMP traps from upstream switches to detect link or session anomalies tied to DIRIS gateways
Track Modbus TCP connection counts and reset rates per device through industrial intrusion detection systems
Forward OT network telemetry into a centralized analytics platform such as a SIEM or data lake for correlation with broader environment events

How to Mitigate CVE-2024-48882

Immediate Actions Required

Inventory all Socomec DIRIS Digiware M-70 devices and identify any running firmware 1.6.9 or earlier
Restrict TCP/502 access to authorized Modbus masters using firewall rules and network segmentation
Apply the vendor-issued firmware update referenced in the Socomec advisory as soon as operationally feasible

Patch Information

Socomec has published a vulnerability advisory for the DIRIS Digiware product line addressing CVE-2024-48882. Asset owners should consult the official Socomec CVE-2024-48882 Vulnerability PDF for the fixed firmware version and supported upgrade paths. Coordinate firmware deployment with maintenance windows to avoid disrupting electrical monitoring.

Workarounds

Place DIRIS Digiware M-70 devices behind a dedicated OT firewall and permit Modbus TCP only from authorized polling servers
Isolate the metering network from corporate IT and remote-access networks using VLANs and access control lists
Deploy a Modbus-aware industrial intrusion prevention system to drop malformed protocol frames before they reach the device
Disable Modbus TCP entirely on devices where it is not required and rely on alternative supported protocols

bash

# Configuration example: restrict Modbus TCP access to authorized masters
# Replace addresses with your environment-specific values
iptables -A FORWARD -p tcp --dport 502 -s 10.10.20.5 -d 10.10.30.0/24 -j ACCEPT
iptables -A FORWARD -p tcp --dport 502 -d 10.10.30.0/24 -j DROP