CVE-2025-23406
📋 TL;DR
An out-of-bounds read vulnerability in Cente middleware TCP/IP Network Series allows attackers to crash affected systems by sending specially crafted TCP packets with malicious MSS option values. This affects systems using Cente's TCP/IP middleware for network communication. The vulnerability requires network access to exploit.
💻 Affected Systems
- Cente middleware TCP/IP Network 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
Complete denial of service causing system crashes and service disruption, potentially leading to extended downtime.
Likely Case
Service disruption through crashes requiring manual restart of affected middleware components.
If Mitigated
Limited impact with proper network segmentation and monitoring detecting anomalous TCP traffic.
🎯 Exploit Status
Exploitation requires sending crafted TCP packets but no authentication needed. No public exploit code identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://www.cente.jp/obstacle/5451/
Restart Required: Yes
Instructions:
1. Review Cente advisory at provided URL. 2. Identify affected middleware versions. 3. Apply vendor-provided patches. 4. Restart middleware services. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict network access to Cente middleware to trusted sources only
iptables -A INPUT -p tcp --dport [PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [PORT] -j DROP
TCP Filtering
allImplement network filtering to block malformed TCP packets with abnormal MSS values
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to trusted sources only
- Deploy intrusion detection systems to monitor for anomalous TCP traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check Cente middleware version against vendor advisory; systems using unpatched versions are vulnerableCheck Version:
Check Cente middleware documentation for version query command specific to deploymentVerify Fix Applied:
Verify middleware version matches patched version from vendor advisory and test TCP connectivity📡 Detection & Monitoring
Log Indicators:
- Unexpected middleware crashes
- TCP connection resets
- Service restart events
Network Indicators:
- TCP packets with abnormal MSS option values
- Multiple connection attempts with crafted packets
SIEM Query:
source="cente_middleware" AND (event_type="crash" OR event_type="restart")