CVE-2025-48022 Overview
A vulnerability has been identified in the Vnet/IP Interface Package provided by Yokogawa Electric Corporation. When the affected product receives maliciously crafted packets, the Vnet/IP software stack process may be terminated, resulting in a denial of service condition. This vulnerability affects industrial control system (ICS) environments where Yokogawa CENTUM VP distributed control systems are deployed.
Critical Impact
Successful exploitation could cause the Vnet/IP software stack to terminate, potentially disrupting industrial process control operations and causing operational downtime in critical infrastructure environments.
Affected Products
- Vnet/IP Interface Package for CENTUM VP R6 (VP6C3300) - Version R1.07.00 or earlier
- Vnet/IP Interface Package for CENTUM VP R7 (VP7C3300) - Version R1.07.00 or earlier
Discovery Timeline
- 2026-02-13 - CVE CVE-2025-48022 published to NVD
- 2026-02-13 - Last updated in NVD database
Technical Details for CVE-2025-48022
Vulnerability Analysis
This vulnerability is classified under CWE-130 (Improper Handling of Length Parameter Inconsistency), which occurs when software does not properly handle discrepancies between length parameters and the actual length of data. In the context of the Vnet/IP Interface Package, the software stack fails to properly validate packet length parameters, allowing an attacker to craft malicious packets that cause process termination.
The vulnerability requires adjacent network access, meaning an attacker must be on the same network segment as the target system. While this limits the attack surface compared to remotely exploitable vulnerabilities, industrial control networks are often interconnected, and compromised adjacent systems could be leveraged for exploitation.
Root Cause
The root cause is improper handling of length parameter inconsistency (CWE-130) within the Vnet/IP software stack. When processing network packets, the software does not adequately validate that declared length fields match the actual data length, leading to undefined behavior and process termination when inconsistent values are encountered.
Attack Vector
The attack requires adjacent network access to the target Vnet/IP system. An attacker positioned on the same network segment can send specially crafted packets with inconsistent length parameters to the vulnerable interface. When processed by the Vnet/IP software stack, these malformed packets trigger a condition that causes the process to terminate unexpectedly.
The attack does not require authentication or user interaction, making it relatively straightforward for an attacker with network proximity. However, the high attack complexity suggests that specific conditions or packet sequences may be required for successful exploitation.
Detection Methods for CVE-2025-48022
Indicators of Compromise
- Unexpected termination or restart events of the Vnet/IP software stack process
- Anomalous network traffic patterns containing malformed or unusually structured packets destined for Vnet/IP interfaces
- Log entries indicating packet processing errors or length validation failures
- Repeated service interruptions on CENTUM VP control systems without apparent operational cause
Detection Strategies
- Implement network traffic analysis to identify malformed packets with inconsistent length fields targeting Vnet/IP ports
- Configure logging and alerting for Vnet/IP process crashes or unexpected restarts
- Deploy network intrusion detection systems (IDS) with signatures for length parameter manipulation attacks
- Monitor for unusual traffic patterns from adjacent network segments targeting control system interfaces
Monitoring Recommendations
- Enable detailed logging on Vnet/IP interface systems and forward logs to a centralized SIEM
- Establish baseline process behavior for Vnet/IP software stack to detect anomalous terminations
- Implement network segmentation monitoring to detect unauthorized lateral movement attempts
- Configure real-time alerts for any Vnet/IP process failures in production environments
How to Mitigate CVE-2025-48022
Immediate Actions Required
- Review the Yokogawa Security Advisory YSAR-26-0002 for detailed mitigation guidance
- Ensure network segmentation isolates Vnet/IP systems from untrusted network segments
- Implement strict access controls to limit which systems can communicate with Vnet/IP interfaces
- Monitor affected systems for signs of exploitation while awaiting patch deployment
Patch Information
Yokogawa Electric Corporation has released a security advisory addressing this vulnerability. Organizations should consult the Yokogawa Security Advisory YSAR-26-0002 for specific patch information, updated software versions, and detailed remediation instructions. Contact Yokogawa support for assistance with patch acquisition and deployment planning.
Workarounds
- Implement strict network segmentation to limit adjacent network access to Vnet/IP systems
- Deploy firewall rules to restrict which systems can send traffic to Vnet/IP interfaces
- Enable packet filtering to block malformed or suspicious packets at network boundaries
- Consider implementing application-layer gateways or proxies to validate traffic before it reaches Vnet/IP systems
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
