CVE-2025-25529
📋 TL;DR
A buffer overflow vulnerability in Digital China DCBC Gateway 200-2.1.1 allows attackers to crash the device or execute arbitrary commands by exploiting insufficient length verification in static NAT rule configuration. This affects organizations using the vulnerable gateway version for network routing and security functions.
💻 Affected Systems
- Digital China DCBC Gateway 200
⚠️ 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
Remote code execution leading to complete device compromise, lateral network movement, and persistent backdoor installation.
Likely Case
Device crash causing service disruption and potential denial of service for network traffic.
If Mitigated
Limited impact with proper network segmentation and access controls preventing exploitation attempts.
🎯 Exploit Status
Exploitation requires access to the configuration interface, which typically requires authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Contact Digital China for patch availability. 2. If patch exists, download from vendor portal. 3. Backup current configuration. 4. Apply patch following vendor instructions. 5. Restart device. 6. Verify functionality.
🔧 Temporary Workarounds
Restrict Configuration Access
allLimit access to the static NAT rule configuration interface to trusted administrators only.
Configure firewall rules to restrict access to management IP/port
Disable Unused Static NAT Rules
allRemove or disable any unnecessary static NAT rules to reduce attack surface.
Login to admin interface and navigate to NAT configuration section
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the gateway from critical systems
- Deploy intrusion detection/prevention systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device version via web interface or CLI. If version is 2.1.1, device is vulnerable.Check Version:
Login to web interface and check System Information or use CLI command 'show version'Verify Fix Applied:
Verify version has been updated beyond 2.1.1 and test static NAT rule functionality.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts to admin interface
- Unusual configuration changes to NAT rules
- Device crash/restart logs
Network Indicators:
- Unusual traffic patterns to/from gateway management interface
- Malformed packets targeting NAT configuration ports
SIEM Query:
source="gateway_logs" AND (event_type="config_change" AND config_section="nat") OR (event_type="auth_failure" AND user="admin")