CVE-2025-11546
📋 TL;DR
This vulnerability allows unauthenticated remote attackers to execute arbitrary operating system commands on affected NEC cluster management software by sending specially crafted network packets. It affects multiple versions of CLUSTERPRO X and EXPRESSCLUSTER X for Linux, including SingleServerSafe variants. Attackers can gain complete control of vulnerable systems without any authentication.
💻 Affected Systems
- CLUSTERPRO X for Linux
- EXPRESSCLUSTER X for Linux
- CLUSTERPRO X SingleServerSafe for Linux
- EXPRESSCLUSTER X SingleServerSafe for Linux
⚠️ 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
Complete system compromise allowing attackers to execute arbitrary commands as root/administrator, install malware, exfiltrate data, pivot to other systems, or disrupt critical cluster operations.
Likely Case
Remote code execution leading to system takeover, data theft, or service disruption in vulnerable cluster environments.
If Mitigated
Limited impact if systems are isolated behind firewalls with strict network access controls and packet filtering.
🎯 Exploit Status
The vulnerability description indicates unauthenticated remote exploitation via crafted network packets, suggesting relatively straightforward exploitation once details are known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check NEC advisory for specific patched versions
Vendor Advisory: https://jpn.nec.com/security-info/secinfo/nv25-006_en.html
Restart Required: Yes
Instructions:
1. Review NEC advisory nv25-006_en.html for specific patch details. 2. Download and apply the appropriate patch from NEC. 3. Restart affected cluster services. 4. Verify the patch is applied correctly.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict network access to cluster management services using firewall rules
iptables -A INPUT -p tcp --dport [cluster_port] -s [trusted_networks] -j ACCEPT
iptables -A INPUT -p tcp --dport [cluster_port] -j DROP
Service Isolation
allRun cluster services on isolated network segments or VLANs
🧯 If You Can't Patch
- Implement strict network access controls to limit which systems can communicate with cluster management ports
- Monitor network traffic to cluster services for anomalous patterns and implement intrusion detection
🔍 How to Verify
Check if Vulnerable:
Check installed version of CLUSTERPRO X or EXPRESSCLUSTER X software and compare against affected versions (4.0-5.2).Check Version:
Consult NEC documentation for version checking commands specific to your installationVerify Fix Applied:
Verify software version is updated beyond affected versions and check NEC advisory for specific patch verification steps.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Unexpected process creation from cluster services
- Authentication bypass attempts in cluster logs
Network Indicators:
- Unusual network traffic patterns to cluster management ports
- Crafted packets targeting cluster service ports
- Outbound connections from cluster nodes to unexpected destinations
SIEM Query:
source="cluster_logs" AND (event_type="command_execution" OR auth_result="bypass") OR dest_port=[cluster_port] AND packet_size>threshold