CVE-2025-48021
📋 TL;DR
A vulnerability in Yokogawa's Vnet/IP Interface Package allows remote attackers to cause denial of service by sending maliciously crafted packets, which can terminate the Vnet/IP software stack process. This affects industrial control systems using CENTUM VP R6 and R7 with the vulnerable interface package. Organizations using these Yokogawa industrial automation products are at risk.
💻 Affected Systems
- Vnet/IP Interface Package for CENTUM VP R6 VP6C3300
- Vnet/IP Interface Package for CENTUM VP R7 VP7C3300
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete disruption of industrial control system communications leading to process shutdown, production loss, or safety system impairment in critical infrastructure environments.
Likely Case
Service interruption of Vnet/IP communications causing temporary loss of monitoring/control capabilities until process restart.
If Mitigated
Isolated network segment prevents exploitation; redundant systems maintain operations while affected component recovers.
🎯 Exploit Status
Exploitation requires sending crafted packets to the Vnet/IP interface; no authentication needed. Attack complexity is low once network access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: R1.08.00 or later
Vendor Advisory: https://web-material3.yokogawa.com/1/39281/files/YSAR-26-0002-E.pdf
Restart Required: Yes
Instructions:
1. Download updated Vnet/IP Interface Package from Yokogawa support portal. 2. Follow Yokogawa's installation guide for CENTUM VP systems. 3. Apply update to all affected systems. 4. Restart Vnet/IP services or reboot system as required.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Vnet/IP interfaces from untrusted networks using firewalls or network segmentation
Access Control Lists
allImplement strict network ACLs to limit which systems can communicate with Vnet/IP interfaces
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Vnet/IP interfaces from all non-essential systems
- Deploy intrusion detection/prevention systems to monitor for malicious packet patterns targeting Vnet/IP
🔍 How to Verify
Check if Vulnerable:
Check Vnet/IP Interface Package version in CENTUM VP system configuration or via Yokogawa system management toolsCheck Version:
Check via CENTUM VP Engineering Station or System View software (vendor-specific tools)Verify Fix Applied:
Verify Vnet/IP Interface Package version is R1.08.00 or later in system configuration📡 Detection & Monitoring
Log Indicators:
- Vnet/IP process termination events
- Unexpected service restarts in system logs
- Network connection attempts to Vnet/IP ports followed by service disruption
Network Indicators:
- Unusual packet patterns to Vnet/IP ports (typically UDP/TCP ports used by Vnet/IP)
- Traffic from unauthorized sources to industrial control network segments
SIEM Query:
source="industrial_control_logs" AND (event_type="process_termination" AND process_name="Vnet/IP") OR (network_alert="malformed_packet" AND dest_port IN (vnet_ip_ports))