CVE-2025-1445
📋 TL;DR
A timing-based vulnerability in RTU500 IEC 61850 TLS connection renegotiation can cause availability issues when IEC61850 communication is active. This affects RTU500 devices configured with IEC61850 client or server functionality using TLS. The vulnerability impacts the CMU where the IEC61850 stack is configured.
💻 Affected Systems
- Hitachi Energy RTU500 series
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Denial of service causing disruption to IEC61850 communication, potentially affecting industrial control system operations.
Likely Case
Intermittent communication failures during TLS renegotiation under specific timing conditions.
If Mitigated
Minimal impact with proper network segmentation and monitoring in place.
🎯 Exploit Status
Requires specific timing conditions during TLS renegotiation with active IEC61850 communication
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in available reference
Vendor Advisory: https://publisher.hitachienergy.com/preview?DocumentId=8DBD000207&languageCode=en&Preview=true
Restart Required: No
Instructions:
1. Review Hitachi Energy advisory 2. Apply recommended firmware update 3. Verify IEC61850 TLS configuration
🔧 Temporary Workarounds
Disable TLS renegotiation
RTU500Configure IEC61850 to use static TLS sessions without renegotiation
Configuration specific to RTU500 IEC61850 settings
🧯 If You Can't Patch
- Implement network segmentation to isolate RTU500 devices
- Monitor IEC61850 communication for abnormal TLS renegotiation patterns
🔍 How to Verify
Check if Vulnerable:
Check RTU500 firmware version and IEC61850 TLS configurationCheck Version:
RTU500-specific firmware check commandVerify Fix Applied:
Verify firmware update applied and test IEC61850 TLS communication📡 Detection & Monitoring
Log Indicators:
- Multiple TLS renegotiation attempts
- IEC61850 communication failures
Network Indicators:
- Abnormal TLS handshake patterns on IEC61850 ports
SIEM Query:
Search for IEC61850 protocol errors or TLS renegotiation events