CVE-2025-26401
📋 TL;DR
A weak password encoding vulnerability in JTEKT's HMI ViewJet C-more series allows local authenticated attackers to obtain authentication information. This affects industrial control systems using these human-machine interface panels. Attackers with local access can potentially extract credentials due to insufficient cryptographic protection.
💻 Affected Systems
- JTEKT HMI ViewJet C-more 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
Attackers obtain administrative credentials, gain full control of HMI systems, and potentially pivot to industrial control networks to disrupt operations or cause physical damage.
Likely Case
Local users with basic access extract credentials to elevate privileges within the HMI system, gaining unauthorized access to control functions.
If Mitigated
With proper network segmentation and access controls, impact is limited to the local HMI system without lateral movement to critical control networks.
🎯 Exploit Status
Exploitation requires local authenticated access to the HMI system. No public exploit code identified at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest firmware version as specified in vendor advisory
Vendor Advisory: https://www.electronics.jtekt.co.jp/en/topics/202503207271/
Restart Required: Yes
Instructions:
1. Download latest firmware from JTEKT support portal. 2. Backup current configuration. 3. Apply firmware update following vendor instructions. 4. Restart HMI system. 5. Verify update and restore configuration if needed.
🔧 Temporary Workarounds
Restrict Local Access
allLimit physical and logical access to HMI systems to authorized personnel only
Implement Network Segmentation
allIsolate HMI systems from other network segments using firewalls or VLANs
🧯 If You Can't Patch
- Implement strict access controls and monitor for unauthorized local access attempts
- Consider replacing vulnerable systems if patching is not feasible in operational environment
🔍 How to Verify
Check if Vulnerable:
Check firmware version against vendor advisory. Systems running versions prior to the patched release are vulnerable.Check Version:
Check HMI system settings or configuration menu for firmware version informationVerify Fix Applied:
Verify firmware version matches or exceeds the patched version specified in vendor advisory.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful login
- Unusual access patterns to credential storage areas
- Unexpected user privilege changes
Network Indicators:
- Unusual network traffic from HMI systems
- Attempts to access credential-related files or memory
SIEM Query:
source="hmi_logs" AND (event_type="authentication" AND result="success" AFTER multiple failures) OR (process="credential_access" AND user!="authorized")